- initial import of the original 0.7.6 release

git-svn-id: https://lampka.siedziba.pl:790/svn/repos/lingot-win32@291 455248ca-bdda-0310-9134-f4ebb693071a

27 files changed, 4886 insertions, 0 deletions

diff --git a/src/Makefile.am b/src/Makefile.am
new file mode 100644
index 0000000..97a8b32
--- /dev/null
+++ b/src/Makefile.am
@@ -0,0 +1,40 @@
+INCLUDES = \
+	$(PACKAGE_CFLAGS) $(GTK_CFLAGS) $(ALSA_CFLAGS)\
+	-DLINGOT_LOCALEDIR=\""$(datadir)/locale"\"
+
+AM_CXXFLAGS =\
+	 -Wall
+
+bin_PROGRAMS = lingot
+
+lingot_SOURCES = \
+	lingot-fft.c\
+	lingot-fft.h\
+	lingot-audio.c\
+	lingot-audio.h\
+	lingot-complex.h\
+	lingot-complex.c\
+	lingot-config.c\
+	lingot-config.h\
+	lingot-core.c\
+	lingot-core.h\
+	lingot-defs.h\
+	lingot-config-dialog.c\
+	lingot-config-dialog.h\
+	lingot-gauge.c\
+	lingot-gauge.h\
+	lingot-mainframe.c\
+	lingot-mainframe.h\
+	lingot-filter.c\
+	lingot-filter.h\
+	lingot-signal.c\
+	lingot-signal.h\
+	lingot.c\
+	lingot-i18n.h
+
+lingot_LDFLAGS =
+
+lingot_LDADD =  \
+	$(PACKAGE_LIBS) $(GTK_LIBS) $(ALSA_LIBS)\
+	 -lpthread
+
diff --git a/src/Makefile.in b/src/Makefile.in
new file mode 100644
index 0000000..d4816fc
--- /dev/null
+++ b/src/Makefile.in
@@ -0,0 +1,560 @@
+# Makefile.in generated by automake 1.9.6 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002,
+# 2003, 2004, 2005  Free Software Foundation, Inc.
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+
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+	lingot-complex.$(OBJEXT) lingot-config.$(OBJEXT) \
+	lingot-core.$(OBJEXT) lingot-config-dialog.$(OBJEXT) \
+	lingot-gauge.$(OBJEXT) lingot-mainframe.$(OBJEXT) \
+	lingot-filter.$(OBJEXT) lingot-signal.$(OBJEXT) \
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+	-DLINGOT_LOCALEDIR=\""$(datadir)/locale"\"
+
+AM_CXXFLAGS = \
+	 -Wall
+
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+	lingot-fft.c\
+	lingot-fft.h\
+	lingot-audio.c\
+	lingot-audio.h\
+	lingot-complex.h\
+	lingot-complex.c\
+	lingot-config.c\
+	lingot-config.h\
+	lingot-core.c\
+	lingot-core.h\
+	lingot-defs.h\
+	lingot-config-dialog.c\
+	lingot-config-dialog.h\
+	lingot-gauge.c\
+	lingot-gauge.h\
+	lingot-mainframe.c\
+	lingot-mainframe.h\
+	lingot-filter.c\
+	lingot-filter.h\
+	lingot-signal.c\
+	lingot-signal.h\
+	lingot.c\
+	lingot-i18n.h
+
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+	@rm -f lingot$(EXEEXT)
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+	  dir=`echo "$$file" | sed -e 's,/[^/]*$$,,'`; \
+	  if test "$$dir" != "$$file" && test "$$dir" != "."; then \
+	    dir="/$$dir"; \
+	    $(mkdir_p) "$(distdir)$$dir"; \
+	  else \
+	    dir=''; \
+	  fi; \
+	  if test -d $$d/$$file; then \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -pR $(srcdir)/$$file $(distdir)$$dir || exit 1; \
+	    fi; \
+	    cp -pR $$d/$$file $(distdir)$$dir || exit 1; \
+	  else \
+	    test -f $(distdir)/$$file \
+	    || cp -p $$d/$$file $(distdir)/$$file \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(PROGRAMS)
+installdirs:
+	for dir in "$(DESTDIR)$(bindir)"; do \
+	  test -z "$$dir" || $(mkdir_p) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+	$(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	  install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	  `test -z '$(STRIP)' || \
+	    echo "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'"` install
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-binPROGRAMS clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-libtool distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-exec-am: install-binPROGRAMS
+
+install-info: install-info-am
+
+install-man:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -rf ./$(DEPDIR)
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-binPROGRAMS uninstall-info-am
+
+.PHONY: CTAGS GTAGS all all-am check check-am clean clean-binPROGRAMS \
+	clean-generic clean-libtool ctags distclean distclean-compile \
+	distclean-generic distclean-libtool distclean-tags distdir dvi \
+	dvi-am html html-am info info-am install install-am \
+	install-binPROGRAMS install-data install-data-am install-exec \
+	install-exec-am install-info install-info-am install-man \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags uninstall uninstall-am \
+	uninstall-binPROGRAMS uninstall-info-am
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lingot-audio.c b/src/lingot-audio.c
new file mode 100644
index 0000000..a0776f6
--- /dev/null
+++ b/src/lingot-audio.c
@@ -0,0 +1,220 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/ioctl.h>
+#include <fcntl.h>
+#include <sys/soundcard.h>
+#include <stdlib.h>
+
+#include "lingot-defs.h"
+#include "lingot-audio.h"
+
+LingotAudio *
+lingot_audio_new (int channels, int rate, int format, char *fdsp)
+{
+  LingotAudio *audio;
+#ifdef ALSA
+  snd_pcm_hw_params_t *hw_params;
+  int err;
+#endif
+
+  audio = malloc (sizeof (LingotAudio));
+  //  int dma  = 4;
+
+#ifdef ALSA
+
+  if ((err =
+       snd_pcm_open (&audio->capture_handle, "default", SND_PCM_STREAM_CAPTURE,
+		     0)) < 0)
+    {
+      fprintf (stderr, "cannot open audio device %s (%s)\n",
+	       fdsp, snd_strerror (err));
+      exit (1);
+    }
+
+  if ((err = snd_pcm_hw_params_malloc (&hw_params)) < 0)
+    {
+      fprintf (stderr, "cannot allocate hardware parameter structure (%s)\n",
+	       snd_strerror (err));
+      exit (1);
+    }
+
+  if ((err = snd_pcm_hw_params_any (audio->capture_handle, hw_params)) < 0)
+    {
+      fprintf (stderr,
+	       "cannot initialize hardware parameter structure (%s)\n",
+	       snd_strerror (err));
+      exit (1);
+    }
+
+  if ((err =
+       snd_pcm_hw_params_set_access (audio->capture_handle, hw_params,
+				     SND_PCM_ACCESS_RW_INTERLEAVED)) < 0)
+    {
+      fprintf (stderr, "cannot set access type (%s)\n", snd_strerror (err));
+      exit (1);
+    }
+
+  if ((err =
+       snd_pcm_hw_params_set_format (audio->capture_handle, hw_params,
+				     SND_PCM_FORMAT_S16_LE)) < 0)
+    {
+      fprintf (stderr, "cannot set sample format (%s)\n", snd_strerror (err));
+      exit (1);
+    }
+
+  if ((err =
+       snd_pcm_hw_params_set_rate_near (audio->capture_handle, hw_params,
+					&rate, 0)) < 0)
+    {
+      fprintf (stderr, "cannot set sample rate (%s)\n", snd_strerror (err));
+      exit (1);
+    }
+
+  if ((err =
+       snd_pcm_hw_params_set_channels (audio->capture_handle, hw_params,
+				       channels)) < 0)
+    {
+      fprintf (stderr, "cannot set channel count (%s)\n", snd_strerror (err));
+      exit (1);
+    }
+
+  if ((err = snd_pcm_hw_params (audio->capture_handle, hw_params)) < 0)
+    {
+      fprintf (stderr, "cannot set parameters (%s)\n", snd_strerror (err));
+      exit (1);
+    }
+
+  snd_pcm_hw_params_free (hw_params);
+
+  if ((err = snd_pcm_prepare (audio->capture_handle)) < 0)
+    {
+      fprintf (stderr, "cannot prepare audio interface for use (%s)\n",
+	       snd_strerror (err));
+      exit (1);
+    }
+
+#else
+
+  audio->dsp = open (fdsp, O_RDONLY);
+  if (audio->dsp < 0)
+    {
+      char buff[80];
+      sprintf (buff, "Unable to open audio device %s", fdsp);
+      perror (buff);
+      exit (-1);
+    }
+
+  //if (ioctl(audio->dsp, SOUND_PCM_READ_CHANNELS, &channels) < 0)
+  if (ioctl (audio->dsp, SNDCTL_DSP_CHANNELS, &channels) < 0)
+    {
+      perror ("Error setting number of channels");
+      exit (-1);
+    }
+
+  /*  if (ioctl(audio->dsp, SOUND_PCM_WRITE_CHANNELS, &channels) < 0)
+     {
+     perror("Error setting number of channels");
+     exit(-1);
+     } */
+
+  // sample size
+  //if (ioctl(audio->dsp, SOUND_PCM_SETFMT, &format) < 0)
+  if (ioctl (audio->dsp, SNDCTL_DSP_SETFMT, &format) < 0)
+    {
+      perror ("Error setting bits per sample");
+      exit (-1);
+    }
+
+  int fragment_size = 1;
+  int DMA_buffer_size = 512;
+  int param = 0;
+
+  for (param = 0; fragment_size < DMA_buffer_size; param++)
+    fragment_size <<= 1;
+
+  param |= 0x00ff0000;
+
+  if (ioctl (audio->dsp, SNDCTL_DSP_SETFRAGMENT, &param) < 0)
+    {
+      perror ("Error setting DMA buffer size");
+      exit (-1);
+    }
+
+  // DMA divisor
+  /*  if (ioctl(audio->dsp, SNDCTL_DSP_SUBDIVIDE, &dma) < 0)
+     {
+     perror("Error setting DMA divisor");
+     exit(-1);
+     }
+
+     // Rate de muestreo / reproduccion
+     if (ioctl(audio->dsp, SOUND_PCM_WRITE_RATE, &rate) < 0)
+     {
+     perror("Error setting write rate");
+     exit(-1);
+     } */
+
+  //  if (ioctl(audio->dsp, SOUND_PCM_READ_RATE, &rate) < 0)
+  if (ioctl (audio->dsp, SNDCTL_DSP_SPEED, &rate) < 0)
+    {
+      perror ("Error setting sample rate");
+      exit (-1);
+    }
+
+  /*
+     // non-blocking reads.
+     if (fcntl(audio->dsp, F_SETFL, O_NONBLOCK) < 0)
+     {
+     perror("Error setting non-blocking reads");
+     exit(-1);
+     }
+   */
+#endif
+
+  return audio;
+}
+
+void
+lingot_audio_destroy (LingotAudio * audio)
+{
+#ifdef ALSA
+  snd_pcm_close (audio->capture_handle);
+#else
+  close (audio->dsp);
+  free (audio);
+#endif
+}
+
+int
+lingot_audio_read (LingotAudio * audio, void *buffer, int size)
+{
+#ifdef ALSA
+  return snd_pcm_readi (audio->capture_handle, buffer, size);
+#else
+  return read (audio->dsp, buffer, size);
+#endif
+}
+
diff --git a/src/lingot-audio.h b/src/lingot-audio.h
new file mode 100644
index 0000000..996c822
--- /dev/null
+++ b/src/lingot-audio.h
@@ -0,0 +1,49 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_AUDIO_H__
+#define __LINGOT_AUDIO_H__
+
+
+//#define ALSA
+
+#ifdef ALSA
+#include <alsa/asoundlib.h>
+#endif
+
+typedef struct _LingotAudio LingotAudio;
+
+struct _LingotAudio
+  {
+  	#ifdef ALSA
+  	snd_pcm_t *capture_handle;
+  	#else
+    int dsp; // file handler.
+    #endif
+  };
+
+LingotAudio* lingot_audio_new(int channels, int rate, int format, char* fdsp);
+void lingot_audio_destroy(LingotAudio* audio);
+int lingot_audio_read(LingotAudio* audio, void* buffer, int size);
+
+#endif
diff --git a/src/lingot-background.xpm b/src/lingot-background.xpm
new file mode 100644
index 0000000..7cac040
--- /dev/null
+++ b/src/lingot-background.xpm
@@ -0,0 +1,139 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+/* XPM */
+static char * background2_xpm[] = {
+"160 100 14 1",
+" 	c None",
+".	c #000000",
+"+	c #EEEEEE",
+"@	c #8B898B",
+"#	c #BDEEBD",
+"$	c #EEBABD",
+"%	c #B9B9B9",
+"&	c #4F4F4F",
+"*	c #848484",
+"=	c #6A6A6A",
+"-	c #D3D3D3",
+";	c #353535",
+">	c #9E9E9E",
+",	c #1B1B1B",
+"................................................................................................................................................................",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@@@@@@@@@@@@@@@@@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@@@@@+++++++++++++++++++@@@@@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@@@@+++++++++++++++++++++++++++++++@@@@@++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++++++++++++++++++++++++@@@@+++++++++++++++++++++++++++++++++++++++++@@@@++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++@@@+++++++++++++++++++++++++++++++++++++++++++++++++@@@+++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++++++++++++++++++@@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++@@@++++++++++++++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++@@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@@+++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++++++@+++++++++++++++++++++++++++++++++++++++++#+++++++++++++++++++++++++++++++++++++++++@++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++++@@++++++++++++++++++++++++++++++$$$$$###############$$$$$++++++++++++++++++++++++++++++@@++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++$$$$$$$$$$###############$$$$$$$$$$+++++++++++++++++++++++++++@@++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++@+++++++++++++++++++++++++$$$$$$$$$$$$$$###############$$$$$$$$$$$$$++++++++++++++++++++++++++@+++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++@@+++++++++++++++++++++++$$$$$$$$$$$$$$$$$###############$$$$$$$$$$$$$$$$$+++++++++++++++++++++++@@+++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++@+++++++++++++++++++++++$$$$$$$$$$$$$$$$$$$###############$$$$$$$$$$$$$$$$$$$+++++++++++++++++++++++@++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++@+++++++++++++++++++++$$$$$$$$$$$$$$$$$$$$$$#######+#######$$$$$$$$$$$$$$$$$$$$$$+++++++++++++++++++++@+++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++@@++++++++++++++++++++$$$$$$$$$$$$$$$$$$$$+++++++++++++++++++++++$$$$$$$$$$$$$$$$$$$$++++++++++++++++++++@@+++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++@++++++++++++++++++++$$$$$$$$$$$$$$$$$+++++++++++++++++++++++++++++++++$$$$$$$$$$$$$$$$$++++++++++++++++++++@++++++++++++++++++++++++.",
+".++++++++++++++++++++++++@+++++++++++++++++++$$$$$$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$$$$$$+++++++++++++++++++@+++++++++++++++++++++++.",
+".+++++++++++++++++++++++@++++++++++++++++++$$$$$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$$$$$++++++++++++++++++@++++++++++++++++++++++.",
+".++++++++++++++++++++++@+++++++++++++++++$$$$$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$$$$$+++++++++++++++++@+++++++++++++++++++++.",
+".++++++++++++++++++++@@+++++++++++++++++$$$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$$$+++++++++++++++++@@+++++++++++++++++++.",
+".+++++++++++++++++++@+++++++++++++++++$$$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$$$+++++++++++++++++@++++++++++++++++++.",
+".++++++++++++++++++@+++++++++++++++++$$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$$+++++++++++++++++@+++++++++++++++++.",
+".+++++++++++++++++@++++++++++++++++$$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$+++++++++++++++++@++++++++++++++++.",
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+".+++++++++++++++@+++++++++++++++$$$$$$$$$$+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++$$$$$$$$$$+++++++++++++++@++++++++++++++.",
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+".+++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++++++++++++++@@@@@@@@@@@+++++++++++++++++++++++++++++++++++++++++++++@@++++++++++++++++++++++++++.",
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+".++++++++++++++++++++++++++++++@@++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++@@++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++@@@+++++++++++++++++++++++@@@+++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++@@++++++++++++++++++++++++++++@+++++++++++++++++++++++++++++@++++++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++@+++++++++++++++++++++++++@@+++++++++++++++++++++++++++++++@@+++++++++++++++++++++++++@+++++++++++++++++++++++++++++++++++.",
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+".+++++++++++++++++++++++++++++++++++++++@@+++++++++++++++++++@+++++++++++++++++++++++++++++++++++++@+++++++++++++++++++@@++++++++++++++++++++++++++++++++++++++.",
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+".++++++++++++++++++++++++++++++++++++++++++@@++++++++++++++@+++++++++++++++++++++++++++++++++++++++++@++++++++++++++@@+++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++@@+++++++++++@+++++++++++++++++++++++++++++++++++++++++++@+++++++++++@@+++++++++++++++++++++++++++++++++++++++++++.",
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+".++++++++++++++++++++++++++++++++++++++++++++++++@++++++@+++++++++++++++++++++++++++++++++++++++++++++++@++++++@+++++++++++++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++++++++++++++++++++++++++++++++++++@@+++@+++++++++++++++++++++++++++++++++++++++++++++++++@+++@@++++++++++++++++++++++++++++++++++++++++++++++++.",
+".+++++++++++++++%&&&++*&&%++++=&%+*-++++++++++++++++@@+@+++++++++++++++++++++++++++++++++++++++++++++++++@+@@++++++++++++++++++++++++*&&*+-=&=-+++-&=-+=+++++++.",
+".+++++++++++++++=-+++**+-;-++=%+&-;+++++++++++++++++++@+++++++++++++++++++++++++++++++++++++++++++++++++++@++++++++++++++++++++++++++&++++;-+%;+++&--=**+++++++.",
+".+++++++++++++++&%>++&+++>>++=>-;=%+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%%+++&>%++&+++&+++;->=;++++++++.",
+".+++++++++++++++.*>;-&+++>>+++=&-;++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>>++>,>*&+&+++&+++-&=>*++++++++.",
+".+++++++++++%>>++++-=&+++>>+++++*%==-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++%&;;&*++++*%&+++&++++++&-&*++++++.",
+".+++++++++++%>>%%+++&&+++*>+++++&=>-=+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>>++*+++>>&+++;+++++%*;-*%+++++.",
+".++++++++++++++-;-+&%*=+-,-++++**=--=+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++>>++>&+-;+;%+>;+++++;-&+*%+++++.",
+".+++++++++++++++-&&%++*&&%+++++=+-==-+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--+++>&=-+-=&=-++++-*+%&*++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+".++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++.",
+"................................................................................................................................................................"};
diff --git a/src/lingot-complex.c b/src/lingot-complex.c
new file mode 100644
index 0000000..9d3b03a
--- /dev/null
+++ b/src/lingot-complex.c
@@ -0,0 +1,82 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "lingot-complex.h"
+
+/**
+ * addition. All parameters are overlapables.
+ */
+void lingot_complex_add(LingotComplex* a, LingotComplex* b, LingotComplex* c)
+  {
+    c->r = a->r + b->r;
+    c->i = a->i + b->i;
+  }
+
+/**
+ * substraction. All parameters are overlapables.
+ */
+void lingot_complex_sub(LingotComplex* a, LingotComplex* b, LingotComplex* c)
+  {
+    c->r = a->r - b->r;
+    c->i = a->i - b->i;
+  }
+
+/**
+ * multiplication. All parameters are overlapables.
+ */
+void lingot_complex_mul(LingotComplex* a, LingotComplex* b, LingotComplex* c)
+  {
+    if ((c != a) && (c != b))
+      {
+        c->r = a->r*b->r- a->i*b->i;
+        c->i = a->i*b->r+ a->r*b->i;
+      }
+    else
+      {
+        LingotComplex r;
+        r.r = a->r*b->r- a->i*b->i;
+        r.i = a->i*b->r+ a->r*b->i;
+        *c = r;
+      }
+  }
+
+/**
+ * division. All parameters are overlapables.
+ */
+void lingot_complex_div(LingotComplex* a, LingotComplex* b, LingotComplex* c)
+  {
+    FLT bm2 = b->r*b->r + b->i*b->i;
+
+    if ((c != a) && (c != b))
+      {
+        c->r = (a->r*b->r+ a->i*b->i)/bm2;
+        c->i = (a->i*b->r- a->r*b->i)/bm2;
+      }
+    else
+      {
+        LingotComplex r;
+        r.r = (a->r*b->r+ a->i*b->i)/bm2;
+        r.i = (a->i*b->r- a->r*b->i)/bm2;
+        *c = r;
+      }
+  }
diff --git a/src/lingot-complex.h b/src/lingot-complex.h
new file mode 100644
index 0000000..e764ed0
--- /dev/null
+++ b/src/lingot-complex.h
@@ -0,0 +1,45 @@
+//-*- C++ -*-

+/*

+ * lingot, a musical instrument tuner.

+ *

+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.

+ *

+ * This file is part of lingot.

+ *

+ * lingot is free software; you can redistribute it and/or modify

+ * it under the terms of the GNU General Public License as published by

+ * the Free Software Foundation; either version 2 of the License, or

+ * (at your option) any later version.

+ *

+ * lingot is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU General Public License for more details.

+ * 

+ * You should have received a copy of the GNU General Public License

+ * along with lingot; if not, write to the Free Software

+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

+ */

+

+#ifndef _LINGOT_COMPLEX_H_

+#define _LINGOT_COMPLEX_H_

+

+#include <math.h>

+#include "lingot-defs.h"

+

+// single complex arithmetic  :)

+

+typedef struct _LingotComplex LingotComplex;

+

+struct _LingotComplex

+  {

+    FLT r;

+    FLT i;

+  };

+

+void lingot_complex_add(LingotComplex* a, LingotComplex* b, LingotComplex* c);

+void lingot_complex_sub(LingotComplex* a, LingotComplex* b, LingotComplex* c);

+void lingot_complex_mul(LingotComplex* a, LingotComplex* b, LingotComplex* c);

+void lingot_complex_div(LingotComplex* a, LingotComplex* b, LingotComplex* c);

+

+#endif

diff --git a/src/lingot-config-dialog.c b/src/lingot-config-dialog.c
new file mode 100644
index 0000000..c0c707f
--- /dev/null
+++ b/src/lingot-config-dialog.c
@@ -0,0 +1,472 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+#include <unistd.h>
+#include <signal.h>
+
+#include "lingot-defs.h"
+
+#include "lingot-core.h"
+#include "lingot-config.h"
+#include "lingot-mainframe.h"
+#include "lingot-config-dialog.h"
+#include "lingot-i18n.h"
+
+/* button press event attention routine. */
+void lingot_config_dialog_callback_click(GtkButton *button,
+    LingotConfigDialog *dialog)
+  {
+    if ((GtkWidget*)button == dialog->button_ok)
+      {
+        lingot_config_dialog_apply(dialog);
+        lingot_config_save(dialog->conf, CONFIG_FILE_NAME);
+        lingot_config_dialog_close(dialog);
+      }
+    else if ((GtkWidget*)button == dialog->button_cancel)
+      {
+        lingot_mainframe_change_config(dialog->mainframe, dialog->conf_old); // restore old configuration.
+        lingot_config_dialog_close(dialog);
+      }
+    else if ((GtkWidget*)button == dialog->button_apply)
+      {
+        lingot_config_dialog_apply(dialog);
+        lingot_config_dialog_rewrite(dialog);
+      }
+    else if ((GtkWidget*)button == dialog->button_default)
+      {
+        lingot_config_reset(dialog->conf);
+        lingot_config_dialog_rewrite(dialog);
+      }
+  }
+
+void lingot_config_dialog_callback_close(GtkWidget *widget,
+    LingotConfigDialog *dialog)
+  {
+    gtk_widget_destroy(dialog->win);
+    lingot_config_dialog_destroy(dialog);
+  }
+
+void lingot_config_dialog_callback_change_sample_rate(GtkWidget *widget,
+    LingotConfigDialog *dialog)
+  {
+    char buff[20];
+    float sample_rate =atof(gtk_combo_box_get_active_text(GTK_COMBO_BOX(dialog->combo_sample_rate)));
+    float oversampling=
+    gtk_spin_button_get_value_as_float(GTK_SPIN_BUTTON(dialog->spin_oversampling));
+    sprintf(buff, " = %0.1f", sample_rate/oversampling);
+    gtk_label_set_text ( GTK_LABEL(dialog->label_sample_rate), buff);
+  }
+
+void lingot_config_dialog_callback_change_a_frequence(GtkWidget *widget,
+    LingotConfigDialog *dialog)
+  {
+    char buff[20];
+
+    float root_freq = 440.0*pow(2.0, gtk_spin_button_get_value_as_float(GTK_SPIN_BUTTON(dialog->spin_root_frequency_error))/1200.0);
+    sprintf(buff, "%%    = %0.2f", root_freq);
+    gtk_label_set_text ( GTK_LABEL(dialog->label_root_frequency), buff);
+  }
+
+void lingot_config_dialog_combo_select_value(GtkWidget* combo, int value)
+  {
+
+    GtkTreeModel* model = gtk_combo_box_get_model(GTK_COMBO_BOX(combo));
+    GtkTreeIter iter;
+
+    gboolean valid = gtk_tree_model_get_iter_first (model, &iter);
+
+    while (valid)
+      {
+        gchar *str_data;
+        gtk_tree_model_get (model, &iter, 0, &str_data, -1);
+        if (atoi(str_data) == value)
+          gtk_combo_box_set_active_iter(GTK_COMBO_BOX(combo), &iter);
+        g_free (str_data);
+        valid = gtk_tree_model_iter_next (model, &iter);
+      }
+  }
+
+void lingot_config_dialog_rewrite(LingotConfigDialog* dialog)
+  {
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_calculation_rate), dialog->conf->calculation_rate);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_visualization_rate), dialog->conf->visualization_rate);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_oversampling), dialog->conf->oversampling);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_root_frequency_error), dialog->conf->root_frequency_error);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_temporal_window), dialog->conf->temporal_window);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_noise_threshold), dialog->conf->noise_threshold_db);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_dft_number), dialog->conf->dft_number);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_dft_size), dialog->conf->dft_size);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_peak_number), dialog->conf->peak_number);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_peak_order), dialog->conf->peak_order);
+    gtk_spin_button_set_value(GTK_SPIN_BUTTON(dialog->spin_peak_rejection_relation), dialog->conf->peak_rejection_relation_db);
+    lingot_config_dialog_combo_select_value(dialog->combo_fft_size,
+        (int) dialog->conf->fft_size);
+    lingot_config_dialog_combo_select_value(dialog->combo_sample_rate,
+        (int) dialog->conf->sample_rate);
+    lingot_config_dialog_callback_change_sample_rate(NULL, dialog);
+    lingot_config_dialog_callback_change_a_frequence(NULL, dialog);
+  }
+
+LingotConfigDialog* lingot_config_dialog_new(LingotMainFrame* frame)
+  {
+    GtkWidget* vertical_box;
+    GtkWidget* frame1;
+    GtkWidget* tab1;
+    GtkWidget* frame2;
+    GtkWidget* tab2;
+    GtkWidget* box;
+    char buff[80];
+    LingotConfigDialog* dialog = malloc(sizeof(LingotConfigDialog));
+
+    dialog->mainframe = frame;
+    dialog->conf = lingot_config_new();
+    dialog->conf_old = lingot_config_new();
+
+    // config copy
+    *dialog->conf = *frame->conf;
+    *dialog->conf_old = *frame->conf;
+
+    dialog->win = gtk_dialog_new_with_buttons (_("lingot configuration"),
+    GTK_WINDOW(frame->win), 0, NULL);
+
+    gtk_container_set_border_width(GTK_CONTAINER(dialog->win), 6);
+
+    // items vertically displayed  
+    vertical_box = gtk_vbox_new(FALSE, 6);
+    gtk_container_add(GTK_CONTAINER (GTK_DIALOG(dialog->win)->vbox), vertical_box);
+
+    frame1 = gtk_frame_new(_("General parameters"));
+    gtk_box_pack_start_defaults(GTK_BOX(vertical_box), frame1);
+
+    tab1 = gtk_table_new(5, 3, FALSE);
+    int row = 0;
+
+    gtk_table_set_col_spacings(GTK_TABLE(tab1), 20);
+    gtk_table_set_row_spacings(GTK_TABLE(tab1), 3);
+    gtk_container_set_border_width(GTK_CONTAINER(tab1), 5);
+
+    gtk_container_add(GTK_CONTAINER(frame1), tab1);
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_calculation_rate = gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->calculation_rate, 1.0,
+            60.0, 0.5, 10.0, 15.0), 0.5, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_calculation_rate), TRUE);
+    gtk_table_attach_defaults(GTK_TABLE(tab1),
+    gtk_label_new(_("Calculation rate")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), dialog->spin_calculation_rate, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), gtk_label_new(_("Hz")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_visualization_rate =gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->visualization_rate,
+            1.0, 60.0, 0.5, 10.0, 15.0), 0.5, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_visualization_rate), TRUE);
+    gtk_table_attach_defaults(GTK_TABLE(tab1),
+    gtk_label_new(_("Visualization rate")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), dialog->spin_visualization_rate, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), gtk_label_new(_("Hz")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->combo_fft_size = gtk_combo_box_new_text();
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_fft_size), "256");
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_fft_size), "512");
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_fft_size), "1024");
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_fft_size), "2048");
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_fft_size), "4096");
+    lingot_config_dialog_combo_select_value(dialog->combo_fft_size,
+        (int) dialog->conf->fft_size);
+
+    gtk_table_attach_defaults(GTK_TABLE(tab1), gtk_label_new(_("FFT size")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), dialog->combo_fft_size, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), gtk_label_new(_("samples")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_noise_threshold =gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->noise_threshold_db,
+            -30.0, 60.0, 0.1, 0.1, 0.1), 0.1, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_noise_threshold), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_noise_threshold), 1) ;
+
+    gtk_table_attach_defaults(GTK_TABLE(tab1),
+    gtk_label_new(_("Noise threshold")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), gtk_label_new(_("dB")), 2, 3, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), dialog->spin_noise_threshold, 1, 2, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    box = gtk_hbox_new (FALSE, FALSE);
+
+    dialog->combo_sample_rate = gtk_combo_box_new_text();
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_sample_rate), "8000");
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_sample_rate), "11025");
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_sample_rate), "22050");
+    gtk_combo_box_append_text(GTK_COMBO_BOX(dialog->combo_sample_rate), "44100");
+
+    lingot_config_dialog_combo_select_value(dialog->combo_sample_rate,
+        (int) dialog->conf->sample_rate);
+
+    dialog->spin_oversampling = gtk_spin_button_new(
+        (GtkAdjustment*) gtk_adjustment_new(dialog->conf->oversampling, 1.0,
+            30.0, 1.0, 10.0, 15.0), 1.0, 1);
+
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_oversampling), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_oversampling), 0) ;
+
+    sprintf(buff, " = %0.1f", atof(gtk_combo_box_get_active_text(GTK_COMBO_BOX(dialog->combo_sample_rate)))
+        /gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(dialog->spin_oversampling)));
+    dialog->label_sample_rate = gtk_label_new(buff);
+
+    gtk_box_pack_start (GTK_BOX(box), dialog->combo_sample_rate, FALSE, FALSE, FALSE);
+    gtk_box_pack_start (GTK_BOX(box), gtk_label_new(" / "), FALSE, FALSE, FALSE);
+    gtk_box_pack_start (GTK_BOX(box), dialog->spin_oversampling, FALSE, FALSE, FALSE);
+    gtk_box_pack_start (GTK_BOX(box), dialog->label_sample_rate, FALSE, FALSE, FALSE);
+
+    gtk_signal_connect(GTK_OBJECT(dialog->combo_sample_rate), "changed",
+        GTK_SIGNAL_FUNC (lingot_config_dialog_callback_change_sample_rate), dialog);
+
+    gtk_signal_connect (GTK_OBJECT (dialog->spin_oversampling), "value_changed",
+        GTK_SIGNAL_FUNC (lingot_config_dialog_callback_change_sample_rate), dialog);
+
+    gtk_table_attach_defaults(GTK_TABLE(tab1),
+    gtk_label_new(_("Sample rate")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), box, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab1), gtk_label_new(_("Hz")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    frame2 = gtk_frame_new(_("Advanced parameters"));
+    gtk_box_pack_start_defaults(GTK_BOX(vertical_box), frame2);
+
+    tab2 = gtk_table_new(7, 3, FALSE);
+    row = 0;
+
+    gtk_table_set_col_spacings(GTK_TABLE(tab2), 20);
+    gtk_table_set_row_spacings(GTK_TABLE(tab2), 3);
+    gtk_container_set_border_width(GTK_CONTAINER(tab2), 5);
+
+    gtk_container_add(GTK_CONTAINER(frame2), tab2);
+
+    // --------------------------------------------------------------------------
+
+    box = gtk_hbox_new (TRUE, FALSE);
+
+    dialog->spin_root_frequency_error = gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->root_frequency_error,
+            -500.0, +500.0, 1.0, 10.0, 15.0), 1.0, 1);
+
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_root_frequency_error), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_root_frequency_error), 0) ;
+
+    gtk_box_pack_start (GTK_BOX(box), gtk_label_new(_(" A (440 Hz) + ")), FALSE, FALSE, FALSE);
+    gtk_box_pack_start (GTK_BOX(box), dialog->spin_root_frequency_error, FALSE, TRUE, FALSE);
+
+    sprintf(buff, "%%    = %0.2f", dialog->conf->root_frequency);
+    dialog->label_root_frequency = gtk_label_new(_(buff));
+
+    gtk_box_pack_start (GTK_BOX(box), dialog->label_root_frequency, FALSE, FALSE, FALSE);
+
+    gtk_signal_connect (GTK_OBJECT (dialog->spin_root_frequency_error), "value_changed",
+        GTK_SIGNAL_FUNC (lingot_config_dialog_callback_change_a_frequence), dialog);
+
+    gtk_table_attach_defaults(GTK_TABLE(tab2),
+    gtk_label_new(_("Root frequency")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), box, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("Hz")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_temporal_window =gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->temporal_window, 0.0,
+            15.0, 0.005, 0.1, 0.1), 0.005, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_temporal_window), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_temporal_window), 3) ;
+
+    gtk_table_attach_defaults(GTK_TABLE(tab2),
+    gtk_label_new(_("Temporal window")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("seconds")), 2, 3, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), dialog->spin_temporal_window, 1, 2, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_dft_number =gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->dft_number, 0.0, 10.0,
+            1.0, 1.0, 1.0), 1.0, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_dft_number), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_dft_number), 0) ;
+
+    gtk_table_attach_defaults(GTK_TABLE(tab2),
+    gtk_label_new(_("DFT number")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), dialog->spin_dft_number, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("DFTs")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_dft_size =gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->dft_size, 4.0, 100.0,
+            1.0, 1.0, 1.0), 1.0, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_dft_size), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_dft_size), 0) ;
+
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("DFT size")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("samples")), 2, 3, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), dialog->spin_dft_size, 1, 2, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_peak_number =gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->peak_number, 1.0,
+            10.0, 1.0, 1.0, 1.0), 1.0, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_peak_number), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_peak_number), 0) ;
+
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("Peak number")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), dialog->spin_peak_number, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("peaks")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_peak_order = gtk_spin_button_new(
+        (GtkAdjustment*)gtk_adjustment_new(dialog->conf->peak_order, 1.0, 5.0,
+            1.0, 1.0, 1.0), 1.0, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_peak_order), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_peak_order), 0) ;
+
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("Peak order")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), dialog->spin_peak_order, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("samples")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->spin_peak_rejection_relation
+        = gtk_spin_button_new(
+            (GtkAdjustment*)gtk_adjustment_new(
+                dialog->conf->peak_rejection_relation_db, 2.0, 40.0, 0.1, 1.0,
+                1.0), 0.1, 1);
+    gtk_spin_button_set_numeric(GTK_SPIN_BUTTON(dialog->spin_peak_rejection_relation), TRUE);
+    gtk_spin_button_set_digits(GTK_SPIN_BUTTON(dialog->spin_peak_rejection_relation), 1);
+
+    gtk_table_attach_defaults(GTK_TABLE(tab2),
+    gtk_label_new(_("Rejection peak relation")), 0, 1, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), dialog->spin_peak_rejection_relation, 1, 2, row, row + 1);
+    gtk_table_attach_defaults(GTK_TABLE(tab2), gtk_label_new(_("dB")), 2, 3, row, row + 1);
+    row++;
+
+    // --------------------------------------------------------------------------
+
+    dialog->button_ok = gtk_button_new_from_stock(GTK_STOCK_OK);
+    dialog->button_cancel = gtk_button_new_from_stock(GTK_STOCK_CANCEL);
+    dialog->button_apply = gtk_button_new_from_stock(GTK_STOCK_APPLY);
+    dialog->button_default = gtk_button_new_with_label(_("Default config"));
+
+    gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog->win)->action_area), dialog->button_default, TRUE, TRUE, 0);
+    gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog->win)->action_area), dialog->button_apply, TRUE, TRUE, 0);
+    gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog->win)->action_area), dialog->button_ok, TRUE, TRUE, 0);
+    gtk_box_pack_start (GTK_BOX (GTK_DIALOG (dialog->win)->action_area), dialog->button_cancel, TRUE, TRUE, 0);
+
+    g_signal_connect(GTK_OBJECT(dialog->button_default), "clicked", GTK_SIGNAL_FUNC(lingot_config_dialog_callback_click), dialog);
+    g_signal_connect(GTK_OBJECT(dialog->button_apply), "clicked", GTK_SIGNAL_FUNC(lingot_config_dialog_callback_click), dialog);
+    g_signal_connect(GTK_OBJECT(dialog->button_ok), "clicked", GTK_SIGNAL_FUNC(lingot_config_dialog_callback_click), dialog);
+    g_signal_connect(GTK_OBJECT(dialog->button_cancel), "clicked", GTK_SIGNAL_FUNC(lingot_config_dialog_callback_click), dialog);
+
+    g_signal_connect(GTK_OBJECT(dialog->win), "destroy", GTK_SIGNAL_FUNC(lingot_config_dialog_callback_close), dialog);
+
+    lingot_config_dialog_rewrite(dialog);
+    gtk_window_set_resizable(GTK_WINDOW(dialog->win), FALSE);
+    gtk_widget_show_all(dialog->win);
+
+    return dialog;
+  }
+
+void lingot_config_dialog_destroy(LingotConfigDialog* dialog)
+  {
+    dialog->mainframe->config_dialog = NULL;
+    lingot_config_destroy(dialog->conf);
+    lingot_config_destroy(dialog->conf_old);
+
+    //gtk_widget_destroy(dialog->win);
+    free(dialog);
+  }
+
+void lingot_config_dialog_apply(LingotConfigDialog* dialog)
+  {
+    GtkWidget* message_dialog;
+
+    dialog->conf->root_frequency_error = gtk_spin_button_get_value_as_float(GTK_SPIN_BUTTON(dialog->spin_root_frequency_error));
+    dialog->conf->calculation_rate = gtk_spin_button_get_value_as_float(GTK_SPIN_BUTTON(dialog->spin_calculation_rate));
+    dialog->conf->visualization_rate = gtk_spin_button_get_value_as_float(GTK_SPIN_BUTTON(dialog->spin_visualization_rate));
+    dialog->conf->temporal_window = gtk_spin_button_get_value_as_float(GTK_SPIN_BUTTON(dialog->spin_temporal_window));
+    dialog->conf->noise_threshold_db = gtk_spin_button_get_value_as_float(GTK_SPIN_BUTTON(dialog->spin_noise_threshold));
+    dialog->conf->oversampling
+        = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(dialog->spin_oversampling));
+    dialog->conf->dft_number= gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(dialog->spin_dft_number));
+    dialog->conf->dft_size = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(dialog->spin_dft_size));
+    dialog->conf->peak_number
+        = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(dialog->spin_peak_number));
+    dialog->conf->peak_order= gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(dialog->spin_peak_order));
+    dialog->conf->peak_rejection_relation_db
+        = gtk_spin_button_get_value_as_int(GTK_SPIN_BUTTON(dialog->spin_peak_rejection_relation));
+    dialog->conf->fft_size = atoi(gtk_combo_box_get_active_text(GTK_COMBO_BOX(dialog->combo_fft_size)));
+    dialog->conf->sample_rate
+        = atoi(gtk_combo_box_get_active_text(GTK_COMBO_BOX(dialog->combo_sample_rate)));
+
+    int result = lingot_config_update_internal_params(dialog->conf);
+
+    lingot_mainframe_change_config(dialog->mainframe, dialog->conf);
+
+    if (!result)
+      {
+        message_dialog
+            = gtk_message_dialog_new(
+            GTK_WINDOW(dialog->win),
+            GTK_DIALOG_DESTROY_WITH_PARENT,
+            GTK_MESSAGE_INFO,
+            GTK_BUTTONS_CLOSE,
+            _("Temporal buffer is smaller than FFT size. It has been increased to %0.3f seconds"), dialog->conf->temporal_window);
+        gtk_dialog_run(GTK_DIALOG(message_dialog));
+        gtk_widget_destroy (message_dialog);
+      }
+  }
+
+void lingot_config_dialog_close(LingotConfigDialog* dialog)
+  {
+    gtk_widget_destroy(dialog->win);
+  }
diff --git a/src/lingot-config-dialog.h b/src/lingot-config-dialog.h
new file mode 100644
index 0000000..208e020
--- /dev/null
+++ b/src/lingot-config-dialog.h
@@ -0,0 +1,74 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_CONFIG_DIALOG_H__
+#define __LINGOT_CONFIG_DIALOG_H__
+
+#include <gtk/gtk.h>
+
+#include "lingot-config.h"
+
+typedef struct _LingotConfigDialog LingotConfigDialog;
+
+struct _LingotConfigDialog
+  {
+
+    // widgets that contains configuration information.
+    GtkWidget* spin_calculation_rate;
+    GtkWidget* spin_visualization_rate;
+    GtkWidget* spin_oversampling;
+    GtkWidget* spin_root_frequency_error;
+    GtkWidget* spin_temporal_window;
+    GtkWidget* spin_noise_threshold;
+    GtkWidget* spin_dft_number;
+    GtkWidget* spin_dft_size;
+    GtkWidget* spin_peak_number;
+    GtkWidget* spin_peak_order;
+    GtkWidget* spin_peak_rejection_relation;
+    GtkWidget* combo_fft_size;
+    GtkWidget* combo_sample_rate;
+
+    GtkWidget* button_ok;
+    GtkWidget* button_cancel;
+    GtkWidget* button_apply;
+    GtkWidget* button_default;
+
+    GtkWidget* label_sample_rate;
+    GtkWidget* label_root_frequency;
+
+    LingotConfig* conf; // provisional configuration.
+    LingotConfig* conf_old; // restoration point for cancel.
+
+    LingotMainFrame* mainframe;
+    
+    GtkWidget* win; // window
+  };
+
+LingotConfigDialog* lingot_config_dialog_new(LingotMainFrame*);
+void lingot_config_dialog_destroy(LingotConfigDialog*);
+
+void lingot_config_dialog_rewrite(LingotConfigDialog*);
+void lingot_config_dialog_apply(LingotConfigDialog*);
+void lingot_config_dialog_close(LingotConfigDialog*);
+
+#endif // __LINGOT_CONFIG_DIALOG_H__
diff --git a/src/lingot-config.c b/src/lingot-config.c
new file mode 100644
index 0000000..c03a717
--- /dev/null
+++ b/src/lingot-config.c
@@ -0,0 +1,261 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <string.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+
+#include "lingot-config.h"
+#include "lingot-mainframe.h"
+
+// the following tokens will appear in the config file.
+char* token[] =
+  { "AUDIO_DEV", "SAMPLE_RATE", "OVERSAMPLING", "ROOT_FREQUENCY_ERROR",
+      "MIN_FREQUENCY", "FFT_SIZE", "TEMPORAL_WINDOW", "NOISE_THRESHOLD",
+      "CALCULATION_RATE", "VISUALIZATION_RATE", "PEAK_NUMBER", "PEAK_ORDER",
+      "PEAK_REJECTION_RELATION", "DFT_NUMBER", "DFT_SIZE", NULL // NULL terminated array
+    };
+
+// print/scan param formats.
+const char* format = "sddffdffffddfdd";
+
+//----------------------------------------------------------------------------
+
+LingotConfig* lingot_config_new()
+  {
+
+    LingotConfig* config = malloc(sizeof(LingotConfig));
+
+    lingot_config_reset(config); // set default values.
+
+    // internal parameters mapped to each token in the config file.
+    void* c_param[] =
+      { &config->audio_dev, &config->sample_rate, &config->oversampling,
+          &config->root_frequency_error, &config->min_frequency,
+          &config->fft_size, &config->temporal_window,
+          &config->noise_threshold_db, &config->calculation_rate,
+          &config->visualization_rate, &config->peak_number,
+          &config->peak_order, &config->peak_rejection_relation_db,
+          &config->dft_number, &config->dft_size };
+
+    memcpy(config->param, c_param, 15*sizeof(void*));
+
+    return config;
+  }
+
+void lingot_config_destroy(LingotConfig* config)
+  {
+    free(config);
+  }
+
+//----------------------------------------------------------------------------
+void lingot_config_reset(LingotConfig* config)
+  {
+    sprintf(config->audio_dev, "%s", "/dev/dsp");
+
+    config->sample_rate = 8000; // Hz
+    config->oversampling = 5;
+    config->root_frequency_error = 0; // Hz
+    config->min_frequency = 15; // Hz
+    config->fft_size = 512; // samples
+    config->temporal_window = 0.32; // seconds
+    config->calculation_rate = 20; // Hz
+    config->visualization_rate = 30; // Hz
+    config->noise_threshold_db = 20.0; // dB
+
+    config->peak_number = 3; // peaks
+    config->peak_order = 1; // samples
+    config->peak_rejection_relation_db = 20; // dB
+
+    config->dft_number = 2; // DFTs
+    config->dft_size = 15; // samples
+
+    config->max_nr_iter = 10; // iterations
+
+    //--------------------------------------------------------------------------
+
+    config->vr = -0.45; // near to minimum
+
+    lingot_config_update_internal_params(config);
+  }
+
+//----------------------------------------------------------------------------
+
+int lingot_config_update_internal_params(LingotConfig* config)
+  {
+    int result = 1;
+
+    // derived parameters.
+    config->root_frequency = 440.0
+        *pow(2.0, config->root_frequency_error/1200.0);
+    config->temporal_buffer_size = (unsigned int)ceil(config->temporal_window
+        *config->sample_rate/config->oversampling);
+    config->read_buffer_size = (unsigned int)ceil(config->sample_rate
+        /(config->calculation_rate*config->oversampling));
+    config->peak_rejection_relation_nu = pow(10.0,
+        config->peak_rejection_relation_db/10.0);
+    config->noise_threshold_nu = pow(10.0, config->noise_threshold_db/10.0);
+
+    if (config->temporal_buffer_size < config->fft_size)
+      {
+        config->temporal_window = ((double) config->fft_size
+            *config->oversampling)/config->sample_rate;
+        config->temporal_buffer_size = config->fft_size;
+        result = 0;
+      }
+
+    return result;
+  }
+
+//----------------------------------------------------------------------------
+
+void lingot_config_save(LingotConfig* config, char* filename)
+  {
+    unsigned int i;
+    FILE* fp;
+
+    if ((fp = fopen(filename, "w")) == NULL)
+      {
+        char buff[100];
+        sprintf(buff, "error saving config file %s ", filename);
+        perror(buff);
+        return;
+      }
+
+    fprintf(fp, "# Config file automatically created by lingot\n\n");
+
+    for (i = 0; token[i]; i++)
+      switch (format[i])
+        {
+        case 's':
+          fprintf(fp, "%s = %s\n", token[i], (char*) config->param[i]);
+          break;
+        case 'd':
+          fprintf(fp, "%s = %d\n", token[i],
+              *((unsigned int*) config->param[i]));
+          break;
+        case 'f':
+          fprintf(fp, "%s = %0.3f\n", token[i], *((FLT*) config->param[i]));
+          break;
+        }
+
+    fclose(fp);
+  }
+
+//----------------------------------------------------------------------------
+
+void lingot_config_load(LingotConfig* config, char* filename)
+  {
+    FILE* fp;
+    float aux;
+    int line;
+    int token_index;
+    char* char_buffer_pointer;
+
+    const static char* delim = " \t=\n";
+    
+#   define MAX_LINE_SIZE 100
+
+    char char_buffer[MAX_LINE_SIZE];
+
+    if ((fp = fopen(filename, "r")) == NULL)
+      {
+        sprintf(char_buffer,
+            "error opening config file %s, assuming default values ", filename);
+        perror(char_buffer);
+        return;
+      }
+
+    line = 0;
+
+    for (;;)
+      {
+
+        line++;
+
+        if (!fgets(char_buffer, MAX_LINE_SIZE, fp))
+        break;;
+
+        //    printf("line %d: %s\n", line, s1);
+
+        if (char_buffer[0] == '#')
+        continue;
+
+        // tokens into the line.
+        char_buffer_pointer = strtok(char_buffer, delim);
+
+        if (!char_buffer_pointer)
+        continue; // blank line.
+
+        for (token_index = 0; token[token_index]; token_index++)
+          {
+            if (!strcmp(char_buffer_pointer, token[token_index]))
+              {
+                break; // found token.
+              }
+          }
+
+        if (!token[token_index])
+          {
+            fprintf(stderr,
+                "warning: parse error at line %i: unknown keyword %s\n",
+                line, char_buffer_pointer);
+            continue;
+          }
+
+        // take the attribute value.
+        char_buffer_pointer = strtok(NULL, delim);
+
+        if (!char_buffer_pointer)
+          {
+            fprintf(stderr, "warning: parse error at line %i: value expected\n",
+                line);
+            continue;
+          }
+
+        // asign the value to the parameter.
+        switch (format[token_index])
+          {
+            case 's':
+            sprintf(((char*) config->param[token_index]), "%s",
+                char_buffer_pointer);
+            break;
+            case 'd':
+            sscanf(char_buffer_pointer, "%d",
+                (unsigned int*) config->param[token_index]);
+            break;
+            case 'f':
+            sscanf(char_buffer_pointer, "%f", &aux);
+            *((FLT*) config->param[token_index]) = aux;
+            break;
+          }
+
+      }
+
+    fclose(fp);
+
+    lingot_config_update_internal_params(config);
+
+#   undef MAX_LINE_SIZE
+  }
diff --git a/src/lingot-config.h b/src/lingot-config.h
new file mode 100644
index 0000000..174730d
--- /dev/null
+++ b/src/lingot-config.h
@@ -0,0 +1,109 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_CONFIG_H__
+#define __LINGOT_CONFIG_H__
+
+#include "lingot-defs.h"
+
+/*
+ Configuration class. Determines the tuner's behaviour.
+ Some parameters are internal only.
+ */
+
+typedef struct _LingotConfig LingotConfig;
+
+struct _LingotConfig
+  {
+    void* param[15]; // parameter pointer array.
+
+    char audio_dev[80]; // default "/dev/dsp"
+    unsigned int sample_rate; // soundcard sample rate.
+    unsigned int oversampling; // oversampling factor.
+
+    // frequency of the root A note (internal parameter).
+    FLT root_frequency;
+
+    FLT root_frequency_error; // deviation of the above root frequency.
+
+    FLT min_frequency; // minimum valid frequency.
+
+    unsigned int fft_size; // number of samples of the FFT.
+
+    FLT calculation_rate;
+    FLT visualization_rate;
+
+    FLT temporal_window; // duration in seconds of the temporal window.
+
+    // samples stored in the temporal window (internal parameter).
+    unsigned int temporal_buffer_size;
+
+    // samples read from soundcard. (internal parameter)
+    unsigned int read_buffer_size;
+
+    FLT noise_threshold_db; // dB
+    FLT noise_threshold_nu; // natural units (internal parameter)
+
+    // frequency finding algorithm configuration
+    //-------------------------------------------
+
+    unsigned int peak_number; // number of maximum peaks considered.
+
+    // number of adyacent samples needed to consider a peak.
+    unsigned int peak_order;
+
+    /* maximum amplitude relation between principal and secondary peaks.
+     The max peak doesn't has to be the fundamental frequency carrier if it
+     has an amplitude relation with the fundamental considered peak lower than
+     this parameter. */
+    FLT peak_rejection_relation_db; // dBs
+    FLT peak_rejection_relation_nu; // natural units (internal)
+
+    // DFT approximation
+    unsigned int dft_number; // number of DFTs.
+    unsigned int dft_size; // samples of each DFT.
+
+    // max iterations for Newton-Raphson algorithm.
+    unsigned int max_nr_iter;
+
+    //----------------------------------------------------------------------------
+
+    // gauge rest value. (gauge contemplates [-0.5, 0.5])
+    FLT vr;
+
+    //----------------------------------------------------------------------------
+  };
+
+LingotConfig* lingot_config_new();
+void lingot_config_destroy(LingotConfig*);
+
+// back to default configuration.
+void lingot_config_reset(LingotConfig*);
+
+// derivate internal parameters from external ones.
+int lingot_config_update_internal_params(LingotConfig*);
+
+void lingot_config_save(LingotConfig*, char* filename);
+void lingot_config_load(LingotConfig*, char* filename);
+
+#endif // __LINGOT_CONFIG_H__
diff --git a/src/lingot-core.c b/src/lingot-core.c
new file mode 100644
index 0000000..d0cdaec
--- /dev/null
+++ b/src/lingot-core.c
@@ -0,0 +1,416 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <math.h>
+#include <sys/soundcard.h>
+#include <string.h>
+#include <errno.h>
+
+#ifndef LIB_FFTW
+# include "lingot-complex.h"
+#endif
+
+#include "lingot-fft.h"
+#include "lingot-signal.h"
+#include "lingot-core.h"
+#include "lingot-config.h"
+
+LingotCore* lingot_core_new(LingotConfig* conf) {
+
+	LingotCore* core = malloc(sizeof(LingotCore));
+
+	core->conf = conf;
+	core->running = 1;
+
+# ifdef LIBSNDOBJ
+#  ifdef OSS
+	core->audio = new SndRTIO(1, SND_INPUT, 512, 512, SHORTSAM_LE, NULL,
+			core->conf->read_buffer_size*core->conf->oversampling, core->conf->sample_rate, core->conf->audio_dev);
+#  endif		  
+#  ifdef ALSA
+	core->audio = new SndRTIO(1, SND_INPUT, 512, 4, SHORTSAM_LE, NULL,
+			core->conf->read_buffer_size*core->conf->oversampling, core->conf->sample_rate, "plughw:0,0");
+#  endif		  
+# else
+	// creates an audio handler.
+	core->audio = lingot_audio_new(1, core->conf->sample_rate, SAMPLE_FORMAT,
+			core->conf->audio_dev);
+# endif
+
+	// since the SPD is simmetrical, we only store the 1st half.
+	if (core->conf->fft_size > 256) {
+		core->spd_fft = malloc((core->conf->fft_size >> 1)*sizeof(FLT));
+		core->X = malloc((core->conf->fft_size >> 1)*sizeof(FLT));
+		memset(core->spd_fft, 0, (core->conf->fft_size >> 1)*sizeof(FLT));
+		memset(core->X, 0, (core->conf->fft_size >> 1)*sizeof(FLT));
+	} else { // if the fft size is 256, we store the whole signal for representation.
+		core->spd_fft = malloc((core->conf->fft_size)*sizeof(FLT));
+		core->X = malloc((core->conf->fft_size)*sizeof(FLT));
+		memset(core->spd_fft, 0, core->conf->fft_size*sizeof(FLT));
+		memset(core->X, 0, (core->conf->fft_size)*sizeof(FLT));
+	}
+
+	core->spd_dft = malloc((core->conf->dft_size)*sizeof(FLT));
+	memset(core->spd_dft, 0, core->conf->dft_size*sizeof(FLT));
+
+	core->diff2_spd_fft = malloc(core->conf->fft_size*sizeof(FLT)); // 2nd derivative from SPD.
+	memset(core->diff2_spd_fft, 0, core->conf->fft_size*sizeof(FLT));
+
+	memset(core->spd_dft, 0, core->conf->dft_size*sizeof(FLT));
+
+#ifndef LIB_FFTW  
+	lingot_fft_create_phase_factors(conf); // creates the phase factors for FFT.
+	core->fft_out = malloc((core->conf->fft_size)*sizeof(LingotComplex)); // complex signal in freq domain.
+	memset(core->fft_out, 0, core->conf->fft_size*sizeof(LingotComplex));
+#else
+	core->fftw_in = new fftw_complex[core->conf->fft_size];
+	memset(core->fftw_in, 0, core->conf->fft_size*sizeof(fftw_complex));
+	core->fftw_out = new fftw_complex[core->conf->fft_size];
+	memset(core->fftw_out, 0, core->conf->fft_size*sizeof(fftw_complex));
+	core->fftwplan = fftw_create_plan(core->conf->fft_size, FFTW_FORWARD, FFTW_ESTIMATE);
+#endif
+
+	// read buffer from soundcard.
+	core->read_buffer= malloc((core->conf->read_buffer_size
+			*core->conf->oversampling)*sizeof(SAMPLE_TYPE));
+	memset(core->read_buffer, 0, (core->conf->read_buffer_size
+			*core->conf->oversampling)*sizeof(SAMPLE_TYPE));
+
+	// read buffer from soundcard in floating point format.
+	core->flt_read_buffer= malloc((core->conf->read_buffer_size
+			*core->conf->oversampling)*sizeof(FLT));
+	memset(core->flt_read_buffer, 0, (core->conf->read_buffer_size
+			*core->conf->oversampling)*sizeof(FLT));
+
+	// stored samples.
+	core->temporal_buffer = malloc((core->conf->temporal_buffer_size)
+			*sizeof(FLT));
+	memset(core->temporal_buffer, 0, core->conf->temporal_buffer_size
+			*sizeof(FLT));
+
+	core->hamming_window_temporal = malloc((core->conf->temporal_buffer_size)
+			*sizeof(FLT));
+	lingot_signal_hamming_window(core->conf->temporal_buffer_size,
+			core->hamming_window_temporal);
+	core->hamming_window_fft = malloc((core->conf->fft_size) *sizeof(FLT));
+	lingot_signal_hamming_window(core->conf->fft_size, core->hamming_window_fft);
+
+	core->windowed_temporal_buffer = malloc((core->conf->temporal_buffer_size)
+			*sizeof(FLT));
+	memset(core->windowed_temporal_buffer, 0, core->conf->temporal_buffer_size
+			*sizeof(FLT));
+	core->windowed_fft_buffer = malloc((core->conf->fft_size) *sizeof(FLT));
+	memset(core->windowed_fft_buffer, 0, core->conf->fft_size *sizeof(FLT));
+
+	/*
+	 * 8 order Chebyshev filters, with wc=0.9/i (normalized respect to
+	 * Pi). We take 0.9 instead of 1 to leave a 10% of safety margin,
+	 * in order to avoid aliased frequencies near to w=Pi, due to non
+	 * ideality of the filter.
+	 *
+	 * The cut frequencies wc=Pi/i, with i=1..20, correspond with the
+	 * oversampling factor, avoiding aliasing at decimation.
+	 * 
+	 * Why Chebyshev filters?, for a given order, those filters yield
+	 * abrupt falls than other ones as Butterworth, making the most of
+	 * the order. Although Chebyshev filters affects more to the phase,
+	 * it doesn't matter due to the analysis is made on the signal
+	 * power distribution (only module).
+	 */
+	core->antialiasing_filter= lingot_filter_cheby_design(8, 0.5, 0.9
+			/core->conf->oversampling);
+
+	// ------------------------------------------------------------
+
+	core->freq = 0.0;
+	return core;
+}
+
+// -----------------------------------------------------------------------
+
+/* Deallocate resources */
+void lingot_core_destroy(LingotCore* core) {
+	pthread_attr_destroy(&core->attr);
+
+#ifdef LIB_FFTW  
+	fftw_destroy_plan(core->fftwplan);
+	free(core->fftw_in);
+	free(core->fftw_out);
+#else
+	lingot_fft_destroy_phase_factors(); // destroy phase factors.
+	free(core->fft_out);
+#endif
+
+	lingot_audio_destroy(core->audio);
+
+	free(core->spd_fft);
+	free(core->X);
+	free(core->spd_dft);
+	free(core->diff2_spd_fft);
+	free(core->read_buffer);
+	free(core->flt_read_buffer);
+	free(core->temporal_buffer);
+
+	free(core->windowed_temporal_buffer);
+	free(core->windowed_fft_buffer);
+
+	free(core->hamming_window_temporal);
+	free(core->hamming_window_fft);
+
+	lingot_filter_destroy(core->antialiasing_filter);
+
+	free(core);
+}
+
+// -----------------------------------------------------------------------
+
+// signal decimation with antialiasing, in & out overlapables.
+void lingot_core_decimate(LingotCore* core, FLT* in, FLT* out) {
+	register unsigned int i, j;
+
+	// low pass filter to avoid aliasing.
+	lingot_filter_filter(core->antialiasing_filter,
+			core->conf->read_buffer_size*core->conf->oversampling, in, in);
+
+	// compression.
+	for (i = j = 0; i < core->conf->read_buffer_size; i++, j
+			+= core->conf->oversampling)
+		out[i] = in[j];
+}
+
+// -----------------------------------------------------------------------
+
+void lingot_core_process(LingotCore* core) {
+	register unsigned int i, k; // loop variables.
+	FLT delta_w_FFT = 2.0*M_PI/core->conf->fft_size;
+	// FFT resolution in rads.  
+
+# ifdef LIBSNDOBJ
+	audio->Read();
+	for (i = 0; i < core->conf->oversampling*core->conf->read_buffer_size; i++)
+	flt_read_buffer[i] = audio->Output(i);
+# else
+	if ((lingot_audio_read(core->audio, core->read_buffer,
+			core->conf->oversampling*core->conf->read_buffer_size
+					*sizeof(SAMPLE_TYPE)))< 0) {
+		//perror("Error reading samples");
+		return;
+	}
+
+	for (i = 0; i < core->conf->oversampling*core->conf->read_buffer_size; i++)
+		core->flt_read_buffer[i] = core->read_buffer[i];
+# endif
+
+	//
+	// just readed:
+	//
+	//  ----------------------------
+	// |bxxxbxxxbxxxbxxxbxxxbxxxbxxx|
+	//  ----------------------------
+	//
+	// <----------------------------> read_buffer_size*oversampling
+	//
+
+	/* we shift the temporal window to leave a hollow where place the new piece
+	 of data read. The buffer is actually a queue. */
+	if (core->conf->temporal_buffer_size > core->conf->read_buffer_size)
+		memcpy(core->temporal_buffer,
+				&core->temporal_buffer[core->conf->read_buffer_size],
+				(core->conf->temporal_buffer_size
+						- core->conf->read_buffer_size) *sizeof(FLT));
+
+	//
+	// previous buffer situation:
+	//
+	//  ------------------------------------------
+	// | xxxxxxxxxxxxxxxxxxxxxx | yyyyy | aaaaaaa |
+	//  ------------------------------------------
+	//                                    <------> read_buffer_size
+	//                           <---------------> fft_size
+	//  <----------------------------------------> temporal_buffer_size
+	//
+	// new situation:
+	//
+	//  ------------------------------------------
+	// | xxxxxxxxxxxxxxxxyyyyaa | aaaaa |         |
+	//  ------------------------------------------   
+	//
+
+	/* we decimate the read signal and put it at the end of the buffer. */
+	if (core->conf->oversampling > 1)
+		lingot_core_decimate(
+				core,
+				core->flt_read_buffer,
+				&core->temporal_buffer[core->conf->temporal_buffer_size - core->conf->read_buffer_size]);
+	else
+		memcpy(
+				&core->temporal_buffer[core->conf->temporal_buffer_size - core->conf->read_buffer_size],
+				core->flt_read_buffer, core->conf->read_buffer_size*sizeof(FLT));
+	//
+	//  ------------------------------------------
+	// | xxxxxxxxxxxxxxxxyyyyaa | aaaaa | bbbbbbb |
+	//  ------------------------------------------ 
+	//
+
+	// ----------------- TRANSFORMATION TO FREQUENCY DOMAIN ----------------
+
+	FLT _1_N2 = 1.0/(core->conf->fft_size*core->conf->fft_size);
+	// SPD normalization constant
+
+	// windowing
+	for (i = 0; i < core->conf->fft_size; i++) {
+		core->windowed_fft_buffer[i]
+				= core->temporal_buffer[core->conf->temporal_buffer_size - core->conf->fft_size + i]
+						*core->hamming_window_fft[i];
+	}
+
+# ifdef LIB_FFTW
+	for (i = 0; i < core->conf->fft_size; i++)
+	fftw_in[i].re = core->windowed_fft_buffer[i];
+
+	// transformation.
+	fftw_one(core->fftwplan, core->fftw_in, core->fftw_out);
+
+	// esteem of SPD from FFT. (normalized squared module)
+	for (i = 0; i < ((core->conf->fft_size > 256) ? (core->conf->fft_size >> 1) : 256); i++)
+	core->spd_fft[i] = (core->fftw_out[i].re*core->fftw_out[i].re +
+			core->fftw_out[i].im*core->fftw_out[i].im)*_1_N2;
+# else
+
+	// transformation.
+	lingot_fft_fft(core->windowed_fft_buffer, core->fft_out,
+			core->conf->fft_size);
+
+	// esteem of SPD from FFT. (normalized squared module)
+	for (i = 0; i < ((core->conf->fft_size > 256) ? (core->conf->fft_size >> 1)
+			: 256); i++)
+		core->spd_fft[i] = (core->fft_out[i].r*core->fft_out[i].r
+				+ core->fft_out[i].i*core->fft_out[i].i)*_1_N2;
+# endif
+
+	// representable piece
+	memcpy(core->X, core->spd_fft,
+			((core->conf->fft_size > 256) ? (core->conf->fft_size >> 1) : 256)
+					*sizeof(FLT));
+
+	// truncated 2nd derivative esteem, to enhance peaks
+	core->diff2_spd_fft[0] = 0.0;
+	for (i = 1; i < (core->conf->fft_size >> 1) - 1; i++) {
+		core->diff2_spd_fft[i] = 2.0*core->spd_fft[i]- core->spd_fft[i - 1]
+				- core->spd_fft[i + 1]; // centred 2nd order derivative, to avoid group delay.
+		if (core->diff2_spd_fft[i] < 0.0)
+			core->diff2_spd_fft[i] = 0.0; // truncation
+	}
+
+	// peaks searching in that signal.
+	int Mi = lingot_signal_get_fundamental_peak(core->conf, core->spd_fft,
+			core->diff2_spd_fft, (core->conf->fft_size >> 1)); // take the fundamental peak.
+
+	if (Mi == (signed) (core->conf->fft_size >> 1)) {
+		core->freq = 0.0;
+		return;
+	}
+
+	FLT w = (Mi - 1)*delta_w_FFT;
+	// frecuencia de la muestra anterior al pico.
+
+	//  Approximation to fundamental frequency by selective DFTs
+	// ---------------------------------------------------------
+
+	FLT d_w = delta_w_FFT;
+	for (k = 0; k < core->conf->dft_number; k++) {
+
+		d_w = 2.0*d_w/(core->conf->dft_size - 1); // resolution in rads.
+
+		if (k == 0) {
+			lingot_fft_spd(core->windowed_fft_buffer, core->conf->fft_size, w
+					+ d_w, d_w, &core->spd_dft[1], core->conf->dft_size- 2);
+			core->spd_dft[0] = core->spd_fft[Mi - 1];
+			core->spd_dft[core->conf->dft_size - 1] = core->spd_fft[Mi + 1]; // 2 samples known.
+		} else
+			lingot_fft_spd(core->windowed_fft_buffer, core->conf->fft_size, w,
+					d_w, core->spd_dft, core->conf->dft_size);
+
+		lingot_signal_get_max(core->spd_dft, core->conf->dft_size, &Mi); // search the maximum.
+
+		w += (Mi - 1)*d_w; // previous sample to the peak.
+	}
+
+	w += d_w; // approximation by DFTs.
+
+	// windowing
+	for (i = 0; i < core->conf->temporal_buffer_size; i++) {
+		core->windowed_temporal_buffer[i] = core->temporal_buffer[i]
+				*core->hamming_window_temporal[i];
+	}
+
+	//  Maximum finding by Newton-Raphson
+	// -----------------------------------
+
+	FLT wk = -1.0e5;
+	FLT wkm1 = w;
+	// first iterator set to the current approximation.
+	FLT d1_SPD, d2_SPD;
+
+	for (k = 0; (k < core->conf->max_nr_iter) && (fabs(wk - wkm1) > 1.0e-8); k++) {
+		wk = wkm1;
+
+		// ! we use the WHOLE temporal window for greater precission.
+		lingot_fft_spd_diffs(core->windowed_temporal_buffer,
+				core->conf->temporal_buffer_size, wk, &d1_SPD, &d2_SPD);
+		//printf("%f %f %f\n", wk, d1_SPD, d2_SPD);
+		wkm1 = wk - d1_SPD/d2_SPD;
+	}
+
+	w = wkm1; // frequency in rads.
+	core->freq = (w*core->conf->sample_rate) /(2.0*M_PI
+			*core->conf->oversampling); // analog frequency.
+
+}
+
+/* start running the core in another thread */
+void lingot_core_start(LingotCore* core) {
+	pthread_attr_init(&core->attr);
+
+	// detached thread.
+	//  pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
+	pthread_create(&core->thread, &core->attr, (void* (*)(void*)) lingot_core_run, core);
+}
+
+/* stop running the core */
+void lingot_core_stop(LingotCore* core) {
+	void* thread_result;
+
+	core->running = 0;
+
+	// wait for the thread exit
+	pthread_join(core->thread, &thread_result);
+}
+
+/* run the core */
+void lingot_core_run(LingotCore* core) {
+	while (core->running) {
+		lingot_core_process(core); // process new data block.
+	}
+}
diff --git a/src/lingot-core.h b/src/lingot-core.h
new file mode 100644
index 0000000..1d58b9a
--- /dev/null
+++ b/src/lingot-core.h
@@ -0,0 +1,109 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_CORE_H__
+#define __LINGOT_CORE_H__
+
+#include <pthread.h>
+
+#include "lingot-defs.h"
+#include "lingot-complex.h"
+#include "lingot-filter.h"
+#include "lingot-config.h"
+
+#ifdef LIB_FFTW
+# include <fftw.h>
+#endif
+
+#ifdef LIBSNDOBJ
+#  include <SndObj/AudioDefs.h>
+#else
+#  include "lingot-audio.h"
+#endif
+
+typedef struct _LingotCore LingotCore;
+
+struct _LingotCore {
+
+	//  -- shared data --
+	FLT freq; // analog frequency calculated.
+	FLT* X; // visual portion of FFT.
+	//  -- shared data --
+
+# ifdef LIBSNDOBJ
+	SndRTIO* audio; // audio handler.
+# else
+	LingotAudio* audio; // audio handler.
+# endif
+
+	SAMPLE_TYPE* read_buffer;
+	FLT* flt_read_buffer;
+	FLT* temporal_buffer; // sample memory.
+
+	// precomputed hamming windows
+	FLT* hamming_window_temporal;
+	FLT* hamming_window_fft;
+
+	// windowed signals
+	FLT* windowed_temporal_buffer;
+	FLT* windowed_fft_buffer;
+
+	// spectral power distribution esteem.
+	FLT* spd_fft;
+	FLT* spd_dft;
+	FLT* diff2_spd_fft;
+
+# ifdef LIB_FFTW
+	fftw_complex* fftw_in;
+	fftw_complex* fftw_out; // complex signals in time and freq.
+	fftw_plan fftwplan;
+# else
+	LingotComplex* fft_out; // complex signal in freq.
+# endif
+
+	LingotFilter* antialiasing_filter; // antialiasing filter for decimation.
+
+	int running;
+
+	LingotConfig* conf; // configuration structure
+
+	// pthread-related  member variables
+	pthread_t thread;
+	pthread_attr_t attr;
+};
+
+//----------------------------------------------------------------
+
+LingotCore* lingot_core_new(LingotConfig*);
+void lingot_core_destroy(LingotCore*);
+
+// start process
+void lingot_core_start(LingotCore*);
+
+// stop process
+void lingot_core_stop(LingotCore*);
+
+// process thread
+void lingot_core_run(LingotCore*);
+
+#endif //__LINGOT_CORE_H__
diff --git a/src/lingot-defs.h b/src/lingot-defs.h
new file mode 100644
index 0000000..09625fa
--- /dev/null
+++ b/src/lingot-defs.h
@@ -0,0 +1,52 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_DEFS_H__
+#define __LINGOT_DEFS_H__
+
+#include <sys/types.h>
+#include "../config.h"
+
+// floating point precission.
+#define FLT                  double
+
+#define SAMPLE_TYPE          int16_t
+#define SAMPLE_FORMAT        AFMT_S16_LE
+
+#define CONFIG_DIR_NAME           ".lingot/"
+#define DEFAULT_CONFIG_FILE_NAME  "lingot.conf"
+extern char CONFIG_FILE_NAME[];
+
+#define QUICK_MESSAGES
+
+#define GTK_EVENTS_RATE      20.0
+#define GAUGE_RATE           60.0
+
+/* object forward declaration */
+typedef struct _LingotMainFrame LingotMainFrame;
+
+// optionally we can use the following libraries
+//#define LIB_FFTW
+//#define LIBSNDOBJ
+
+#endif
diff --git a/src/lingot-fft.c b/src/lingot-fft.c
new file mode 100644
index 0000000..18de134
--- /dev/null
+++ b/src/lingot-fft.c
@@ -0,0 +1,177 @@
+//-*- C++ -*-

+/*

+ * lingot, a musical instrument tuner.

+ *

+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.

+ *

+ * This file is part of lingot.

+ *

+ * lingot is free software; you can redistribute it and/or modify

+ * it under the terms of the GNU General Public License as published by

+ * the Free Software Foundation; either version 2 of the License, or

+ * (at your option) any later version.

+ *

+ * lingot is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU General Public License for more details.

+ * 

+ * You should have received a copy of the GNU General Public License

+ * along with lingot; if not, write to the Free Software

+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

+ */

+

+#include <math.h>

+#include <stdlib.h>

+

+#include "lingot-fft.h"

+#include "lingot-config.h"

+

+/*

+ DFT functions.

+ */

+

+#ifndef LIB_FFTW

+

+#include "lingot-complex.h"

+

+// phase factor table, for FFT optimization.

+LingotComplex* wn;

+

+// creates the phase factor table.

+void lingot_fft_create_phase_factors(LingotConfig* conf)

+  {

+    FLT alpha;

+    unsigned int i;

+

+    wn = (LingotComplex*) malloc((conf->fft_size >> 1)*sizeof(LingotComplex));

+

+    for (i = 0; i < (conf->fft_size >> 1); i++)

+      {

+        alpha = -2.0*i*M_PI/conf->fft_size;

+        wn[i].r = cos(alpha);

+        wn[i].i = sin(alpha);

+      }

+  }

+

+void lingot_fft_destroy_phase_factors()

+  {

+    free(wn);

+  }

+

+//------------------------------------------------------------------------

+

+// Fast Fourier Transform.

+void _lingot_fft_fft(FLT* in, LingotComplex* out, unsigned long int N,

+    unsigned long int offset, unsigned long int d1, unsigned long int step)

+  {

+    LingotComplex X1, X2;

+    unsigned long int Np2 = (N >> 1); // N/2

+    register unsigned long int a, b, c, q;

+

+    if (N == 2)

+      { // butterfly for N = 2;

+

+        X1.r = in[offset];

+        X1.i = 0.0;

+        X2.r = in[offset + step];

+        X2.i = 0.0;

+

+        lingot_complex_add(&X1, &X2, &out[d1]);

+        lingot_complex_sub(&X1, &X2, &out[d1 + Np2]);

+

+        return;

+      }

+

+    _lingot_fft_fft(in, out, Np2, offset, d1, step << 1);

+    _lingot_fft_fft(in, out, Np2, offset + step, d1 + Np2, step << 1);

+

+    for (q = 0, c = 0; q < (N >> 1); q++, c += step)

+      {

+

+        a = q + d1;

+        b = a + Np2;

+

+        X1 = out[a];

+        lingot_complex_mul(&out[b], &wn[c], &X2);

+        lingot_complex_add(&X1, &X2, &out[a]);

+        lingot_complex_sub(&X1, &X2, &out[b]);

+      }

+  }

+

+void lingot_fft_fft(FLT* in, LingotComplex* out, unsigned long int N)

+  {

+    _lingot_fft_fft(in, out, N, 0, 0, 1);

+  }

+

+#endif

+

+//------------------------------------------------------------------------

+

+

+/* Spectral Power Distribution esteem, selectively in frequency, by DFT.

+ transforms signal in of N1 samples from frequency wi, with sample

+ separation of dw rads, storing the result on buffer out with N2 samples. */

+void lingot_fft_spd(FLT* in, int N1, FLT wi, FLT dw, FLT* out, int N2)

+  {

+    FLT Xr, Xi;

+    FLT wn;

+    FLT N1_2 = N1*N1;

+    register int i, n;

+

+    for (i = 0; i < N2; i++)

+      {

+

+        Xr = 0.0;

+        Xi = 0.0;

+

+        for (n = 0; n < N1; n++)

+          { // O(n1*n2)  :(

+

+            wn = (wi + dw*i)*n;

+            Xr = Xr + cos(wn)*in[n];

+            Xi = Xi - sin(wn)*in[n];

+          }

+

+        out[i] = (Xr*Xr + Xi*Xi)/N1_2; // normalized squared module.

+      }

+  }

+

+//------------------------------------------------------------------------

+

+/*

+ Evaluates 1st and 2nd derivatives from SPD at frequency w.

+ */

+void lingot_fft_spd_diffs(FLT* in, int N, FLT w, FLT* out_d1, FLT* out_d2)

+  {

+    FLT x_cos_wn;

+    FLT x_sin_wn;

+    register int n;

+

+    FLT SUM_x_sin_wn = 0.0;

+    FLT SUM_x_cos_wn = 0.0;

+    FLT SUM_x_n_sin_wn = 0.0;

+    FLT SUM_x_n_cos_wn = 0.0;

+    FLT SUM_x_n2_sin_wn = 0.0;

+    FLT SUM_x_n2_cos_wn = 0.0;

+

+    for (n = 0; n < N; n++)

+      {

+

+        x_cos_wn = in[n]*cos(w*n);

+        x_sin_wn = in[n]*sin(w*n);

+

+        SUM_x_sin_wn += x_sin_wn;

+        SUM_x_cos_wn += x_cos_wn;

+        SUM_x_n_sin_wn += x_sin_wn*n;

+        SUM_x_n_cos_wn += x_cos_wn*n;

+        SUM_x_n2_sin_wn += x_sin_wn*n*n;

+        SUM_x_n2_cos_wn += x_cos_wn*n*n;

+      }

+

+    FLT N_2 = N*N;

+    *out_d1 = 2.0*(SUM_x_sin_wn*SUM_x_n_cos_wn - SUM_x_cos_wn*SUM_x_n_sin_wn)

+        /N_2;

+    *out_d2 = 2.0*(SUM_x_n_cos_wn*SUM_x_n_cos_wn - SUM_x_sin_wn*SUM_x_n2_sin_wn

+        +SUM_x_n_sin_wn*SUM_x_n_sin_wn - SUM_x_cos_wn*SUM_x_n2_cos_wn)/N_2;

+  }

diff --git a/src/lingot-fft.h b/src/lingot-fft.h
new file mode 100644
index 0000000..b958416
--- /dev/null
+++ b/src/lingot-fft.h
@@ -0,0 +1,52 @@
+//-*- C++ -*-

+/*

+ * lingot, a musical instrument tuner.

+ *

+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.

+ *

+ * This file is part of lingot.

+ *

+ * lingot is free software; you can redistribute it and/or modify

+ * it under the terms of the GNU General Public License as published by

+ * the Free Software Foundation; either version 2 of the License, or

+ * (at your option) any later version.

+ *

+ * lingot is distributed in the hope that it will be useful,

+ * but WITHOUT ANY WARRANTY; without even the implied warranty of

+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

+ * GNU General Public License for more details.

+ * 

+ * You should have received a copy of the GNU General Public License

+ * along with lingot; if not, write to the Free Software

+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

+ */

+

+#ifndef _LINGOT_FFT_H_

+#define _LINGOT_FFT_H_

+

+/*

+ Fourier transforms.

+ */

+

+#include "lingot-defs.h"

+

+#ifndef LIB_FFTW

+

+#  include "lingot-complex.h"

+#  include "lingot-config.h"

+

+void lingot_fft_create_phase_factors(LingotConfig* conf);

+void lingot_fft_destroy_phase_factors();

+

+// Fast Fourier Transform implementation.

+void lingot_fft_fft(FLT* in, LingotComplex* out, unsigned long int N);

+

+#endif // not LIB_FFTW

+

+// Spectral Power Distribution (SPD) esteem, selectively in frequency.

+void lingot_fft_spd(FLT* in, int N1, FLT wi, FLT dw, FLT* out, int N2);

+

+// first and second SPD derivatives at frequency w.

+void lingot_fft_spd_diffs(FLT* in, int N, FLT w, FLT* out_d1, FLT* out_d2);

+

+#endif

diff --git a/src/lingot-filter.c b/src/lingot-filter.c
new file mode 100644
index 0000000..f3c5528
--- /dev/null
+++ b/src/lingot-filter.c
@@ -0,0 +1,258 @@
+//-*- C++ -*-
+/*
+ * filter, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of filter.
+ *
+ * filter is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * filter is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with filter; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <memory.h>
+#include <math.h>
+
+#include "lingot-complex.h"
+#include "lingot-filter.h"
+
+#define max(a,b) (((a)<(b))?(b):(a))
+
+// given each polynomial order and coefs, with optional initial status.
+LingotFilter* lingot_filter_new(unsigned int Na, unsigned int Nb, FLT* a, FLT* b) {
+	unsigned int i;
+	LingotFilter* filter = malloc(sizeof(LingotFilter));
+	filter->N = max(Na, Nb);
+
+	filter->a = malloc((filter->N + 1)*sizeof(FLT));
+	filter->b = malloc((filter->N + 1)*sizeof(FLT));
+	filter->s = malloc((filter->N + 1)*sizeof(FLT));
+
+	for (i = 0; i < filter->N + 1; i++)
+		filter->a[i] = filter->b[i] = filter->s[i] = 0.0;
+
+	memcpy(filter->a, a, (Na + 1)*sizeof(FLT));
+	memcpy(filter->b, b, (Nb + 1)*sizeof(FLT));
+
+	for (i = 0; i < filter->N + 1; i++) {
+		filter->a[i] /= a[0]; // polynomial normalization.
+		filter->b[i] /= a[0];
+	}
+
+	return filter;
+}
+
+void lingot_filter_destroy(LingotFilter* filter) {
+	free(filter->a);
+	free(filter->b);
+	free(filter->s);
+
+	free(filter);
+}
+
+// Digital Filter Implementation II, in & out overlapables.
+void lingot_filter_filter(LingotFilter* filter, unsigned int n, FLT* in,
+		FLT* out) {
+	FLT w, y;
+	register unsigned int i;
+	register int j;
+
+	for (i = 0; i < n; i++) {
+
+		w = in[i];
+		y = 0.0;
+
+		for (j = filter->N - 1; j >= 0; j--) {
+			w -= filter->a[j + 1]*filter->s[j];
+			y += filter->b[j + 1]*filter->s[j];
+			filter->s[j + 1] = filter->s[j];
+		}
+
+		y += w*filter->b[0];
+		filter->s[0] = w;
+
+		out[i] = y;
+	}
+}
+
+// single sample filtering
+FLT lingot_filter_filter_sample(LingotFilter* filter, FLT in)
+{
+	FLT result;
+
+	lingot_filter_filter(filter, 1, &in, &result);
+	return result;
+}
+
+// vector prod
+void lingot_filter_vector_product(int n, LingotComplex* vector,
+		LingotComplex* result) {
+	register int i;
+	LingotComplex aux1;
+
+	result->r = 1.0;
+	result->i = 0.0;
+
+	for (i = 0; i < n; i++) {
+		aux1.r = -vector[i].r;
+		aux1.i = -vector[i].i;
+		lingot_complex_mul(result, &aux1, result);
+	}
+
+}
+
+// Chebyshev filters
+LingotFilter* lingot_filter_cheby_design(unsigned int n, FLT Rp, FLT wc) {
+	int i; // loops
+	int k;
+	int p;
+
+	FLT* a
+	= malloc((n + 1)*sizeof(FLT));
+	FLT* b
+	= malloc((n + 1)*sizeof(FLT));
+
+	FLT* new_a
+	= malloc((n + 1)*sizeof(FLT));
+	FLT* new_b
+	= malloc((n + 1)*sizeof(FLT));
+
+	// locate poles
+	LingotComplex* pole = malloc(n*sizeof(LingotComplex));
+
+	for (i = 0; i < n; i++) {
+		pole[i].r = 0.0;
+		pole[i].i = 0.0;
+	}
+
+	FLT T = 2.0;
+	// 2Hz
+	FLT W = 2.0/T*tan(M_PI*wc/T);
+
+	FLT epsilon = sqrt(pow(10.0, 0.1*Rp) - 1);
+	FLT v0 = asinh(1/epsilon)/n;
+
+	FLT sv0 = sinh(v0);
+	FLT cv0 = cosh(v0);
+
+	FLT t;
+
+	for (i = -(n-1), k = 0; k < n; i+=2, k++) {
+		t = M_PI*i/(2.0*n);
+		pole[k].r = -sv0*cos(t);
+		pole[k].i = cv0*sin(t);
+	}
+
+	LingotComplex gain;
+
+	lingot_filter_vector_product(n, pole, &gain);
+
+	if ((n&1)==0) {// even
+		FLT f = pow(10.0, -0.05*Rp);
+		gain.r *= f;
+		gain.i *= f;
+	}
+
+	FLT f = pow(W, n);
+	gain.r *= f;
+	gain.i *= f;
+
+	for (i = 0; i < n; i++) {
+		pole[i].r *= W;
+		pole[i].i *= W;
+	}
+
+	// bilinear transform
+	LingotComplex* sp = malloc(n*sizeof(LingotComplex));
+
+	for (i = 0; i < n; i++) {
+		sp[i].r = (2.0 - pole[i].r*T)/T;
+		sp[i].i = (0.0 - pole[i].i*T)/T;
+	}
+
+	LingotComplex tmp1;
+	LingotComplex aux2;
+
+	lingot_filter_vector_product(n, sp, &tmp1);
+
+	free(sp);
+
+	lingot_complex_div(&gain, &tmp1, &gain);
+
+	for (i = 0; i < n; i++) {
+		tmp1.r = (2.0 + pole[i].r*T);
+		tmp1.i = (0.0 + pole[i].i*T);
+		aux2.r = (2.0 - pole[i].r*T);
+		aux2.i = (0.0 - pole[i].i*T);
+		lingot_complex_div(&tmp1, &aux2, &pole[i]);
+	}
+
+	// compute filter coefficients from pole/zero values
+	a[0] = 1.0;
+	b[0] = 1.0;
+	new_a[0] = 1.0;
+	new_b[0] = 1.0;
+
+	for (i = 1; i <= n; i++) {
+		a[i] = 0.0;
+		b[i] = 0.0;
+		new_a[i] = 0.0;
+		new_b[i] = 0.0;
+	}
+
+	if ((n & 1) == 1) // odd
+	{
+		// first subfilter is first order
+		a[1] = -pole[n/2].r;
+		b[1] = 1.0;
+	}
+
+	// iterate over the conjugate pairs
+	for (p = 0; p < n/2; p++) {
+		FLT b1 = 2.0;
+		FLT b2 = 1.0;
+
+		FLT a1 = -2.0*pole[p].r;
+		FLT a2 = pole[p].r*pole[p].r + pole[p].i*pole[p].i;
+
+		// 2nd order subfilter per each pair
+		new_a[1] = a[1] + a1*a[0];
+		new_b[1] = b[1] + b1*b[0];
+
+		// poly multiplication
+		for (i = 2; i <= n; i++) {
+			new_a[i] = a[i] + a1*a[i - 1]+ a2*a[i - 2];
+			new_b[i] = b[i] + b1*b[i - 1]+ b2*b[i - 2];
+		}
+		for (i = 1; i <= n; i++) {
+			a[i] = new_a[i];
+			b[i] = new_b[i];
+		}
+	}
+
+	gain.r = fabs(gain.r);
+	for (i = 0; i <= n; i++) {
+		b[i] *= gain.r;
+	}
+
+	LingotFilter* result = lingot_filter_new(n, n, a, b);
+
+	free(a);
+	free(b);
+	free(new_a);
+	free(new_b);
+	free(pole);
+
+	return result;
+}
diff --git a/src/lingot-filter.h b/src/lingot-filter.h
new file mode 100644
index 0000000..b2ea389
--- /dev/null
+++ b/src/lingot-filter.h
@@ -0,0 +1,66 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_FILTER_H__
+#define __LINGOT_FILTER_H__
+
+#include <fcntl.h>
+#include <stdlib.h>
+
+#include "lingot-defs.h"
+
+/*
+ digital filtering implementation.
+ */
+
+typedef struct _LingotFilter LingotFilter;
+
+struct _LingotFilter
+  {
+
+    FLT* a;
+    FLT* b; // coefs
+    FLT* s; // status
+
+    unsigned int N;
+
+  };
+
+LingotFilter
+    * lingot_filter_new(unsigned int Na, unsigned int Nb, FLT* a, FLT* b);
+
+/**
+ * Design a Chebyshev type I low pass filter with Rp dB of pass band ripple
+ * with cutoff pi*wc radians.
+ */
+LingotFilter* lingot_filter_cheby_design(unsigned int order, FLT Rp, FLT wc);
+
+void lingot_filter_destroy(LingotFilter*);
+
+// Digital Filter Implementation II, in & out overlapables. Vector filtering
+void lingot_filter_filter(LingotFilter*, unsigned int n, FLT* in, FLT* out);
+
+// sample filtering
+FLT lingot_filter_filter_sample(LingotFilter*, FLT in);
+
+#endif
diff --git a/src/lingot-gauge.c b/src/lingot-gauge.c
new file mode 100644
index 0000000..d092ed1
--- /dev/null
+++ b/src/lingot-gauge.c
@@ -0,0 +1,92 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include "lingot-gauge.h"
+
+LingotGauge* lingot_gauge_new(FLT initial_position)
+  {
+
+    //
+    // ----- ERROR GAUGE FILTER CONFIGURATION -----
+    //
+    // dynamic model of the gauge:
+    //
+    //               2
+    //              d                              d      
+    //              --- s(t) = k (e(t) - s(t)) - q -- s(t)
+    //                2                            dt     
+    //              dt
+    //
+    // acceleration of gauge position 's(t)' linealy depends on the difference
+    // respect to the input stimulus 'e(t)' (destination position). Inserting
+    // a friction coefficient 'q', acceleration proportionaly diminish with
+    // velocity (typical friction in mechanics). 'k' is the adaptation constant,
+    // and depends on the gauge mass.
+    //
+    // with the following derivatives approximation (valid for high sample rate):
+    //
+    //                 d
+    //                 -- s(t) ~= (s[n] - s[n - 1])*fs
+    //                 dt
+    //
+    //            2
+    //           d                                            2
+    //           --- s(t) ~= (s[n] - 2*s[n - 1] + s[n - 2])*fs
+    //             2
+    //           dt
+    //
+    // we can obtain a difference equation, and implement it with an IIR digital
+    // filter.
+    //
+
+    FLT k = 60;
+    // adaptation constant.
+    FLT q = 6;
+    // friction coefficient.
+
+    FLT a[] =
+      {
+        k + GAUGE_RATE*(q + GAUGE_RATE),
+        -GAUGE_RATE*(q + 2.0*GAUGE_RATE),
+        GAUGE_RATE*GAUGE_RATE};
+    FLT b[] =
+      { k};
+
+    LingotGauge* gauge = malloc(sizeof(LingotGauge));
+    
+    gauge->filter = lingot_filter_new( 2, 0, a, b );
+    lingot_gauge_compute(gauge, initial_position);
+    return gauge;
+  }
+
+void lingot_gauge_destroy(LingotGauge* gauge)
+  {
+    lingot_filter_destroy(gauge->filter);
+    free(gauge);
+  }
+
+void lingot_gauge_compute(LingotGauge* gauge, FLT sample)
+  {
+    gauge->position = lingot_filter_filter_sample(gauge->filter, sample);
+  }
+
diff --git a/src/lingot-gauge.h b/src/lingot-gauge.h
new file mode 100644
index 0000000..44b1a94
--- /dev/null
+++ b/src/lingot-gauge.h
@@ -0,0 +1,46 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_GAUGE_H__
+#define __LINGOT_GAUGE_H__
+
+#include "lingot-defs.h"
+#include "lingot-filter.h"
+
+/*
+ * Implements the dynamic behaviour of the gauge with a digital filter.
+ */
+
+typedef struct _LingotGauge LingotGauge;
+
+struct _LingotGauge
+  {
+    LingotFilter* filter;
+    FLT position;
+  };
+
+LingotGauge* lingot_gauge_new(FLT);
+void lingot_gauge_destroy(LingotGauge*);
+void lingot_gauge_compute(LingotGauge*, FLT);
+
+#endif /*__LINGOT_GAUGE_H__*/
diff --git a/src/lingot-i18n.h b/src/lingot-i18n.h
new file mode 100644
index 0000000..cded340
--- /dev/null
+++ b/src/lingot-i18n.h
@@ -0,0 +1,42 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef LINGOTI18N_H_
+#define LINGOTI18N_H_
+
+#include <libintl.h>
+#include <locale.h>
+#include <langinfo.h>
+
+#ifdef HAVE_CONFIG_H
+#include "config.h"
+#endif
+
+#ifdef ENABLE_NLS
+#undef _
+#    define _(String) (const char*) gettext (String)
+#else
+#    define _(String) (String)
+#endif
+
+#endif /*LINGOTI18N_H_*/
diff --git a/src/lingot-logo.xpm b/src/lingot-logo.xpm
new file mode 100644
index 0000000..6e17b52
--- /dev/null
+++ b/src/lingot-logo.xpm
@@ -0,0 +1,343 @@
+/* XPM */
+static const char *lingotlogo[] = {
+/* columns rows colors chars-per-pixel */
+"80 80 257 2",
+"   c black",
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+"X  c #2F7542BE2093",
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+"*  c #51CB55B43725",
+"=  c #564F5A4C3B43",
+"-  c #5A7D5D3C3E4E",
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+":  c #5C5B603040B4",
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+"9  c #745F74285424",
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+"S H 3.H.F.l.l.F.F.F.H.x.k.-.:.H.J.J.J.H.k.:.H.J.H.H.H.H.F.F.l.H.H.H.H.:.-.F.H.J.H.T < T F.H.H.F.3 o 3 F.J.H.H.H.J.z.-.;.:.F.H.H.J.J.H.J.J.H.:.H.H.H.J.J.J.+.H S ",
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+"YXH S $.H.H.H.J.J.J.J.H.J.J.J.J.J.H.J.H.J.J.J.J.J.J.J.J.H.H.J.J.J.J.H.J.H.J.J.J.J.:.3 # + = = * @ - +.H.J.H.J.H.J.H.J.J.J.J.J.J.H.J.H.J.J.J.J.J.J.J.J.H.$.H H YX",
+"YXH H J k.J.H.H.J.H.J.J.J.J.J.J.J.J.J.J.H.J.H.H.J.H.J.H.J.J.H.J.H.J.J.J.H.J.H.J.J.L.:.~ 9 > 2 3 T :.H.H.J.J.J.J.J.J.H.J.H.J.H.J.J.J.J.J.J.H.H.J.H.J.L.:.P S H YX",
+"YXYXH S Q z.J.J.J.H.J.H.J.J.J.J.H.J.H.J.J.J.J.J.J.J.J.J.H.J.J.J.J.J.J.J.J.H.J.J.J.J.J.J.F.:.F.F.H.H.H.H.H.J.H.H.J.J.J.J.J.J.H.H.J.J.H.J.H.H.H.H.H.H.F.W S H YXYX",
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+"YXYXYXYXYXH H P %.x.J.J.J.J.J.J.J.J.J.J.H.F.H.H.J.H.H.H.J.J.J.J.J.J.J.J.H.H.H.F.J.J.J.J.H.F.H.H.H.H.H.H.J.J.H.H.J.J.H.F.J.H.H.H.J.J.J.L.J.J.F.$.W H H YXYXYXYXYX",
+"YXYXYXYXYXH H H J U #.:.z.z.x.x.F.F.F.F.F.F.z.F.F.F.F.l.F.F.F.F.F.z.F.F.F.F.F.F.F.F.F.F.F.F.z.F.F.F.z.F.F.F.F.z.F.F.F.F.F.F.F.z.F.F.z.:.:.$.W H S S S YXYXYXYXYX",
+"YXYXYXYXYXYXYXYXJ S S J J ' ' ' W ' { T W { W W W W W W W W W W W W W ' ' T W { T { W W { W W W W W W W W W W W W W W W W W W W W { W J W H S S YXYXYXYXYXYXYXYX"
+};
diff --git a/src/lingot-mainframe.c b/src/lingot-mainframe.c
new file mode 100644
index 0000000..a98c16d
--- /dev/null
+++ b/src/lingot-mainframe.c
@@ -0,0 +1,766 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <math.h>
+#include <unistd.h>
+#include <signal.h>
+#include <string.h>
+
+#include "lingot-defs.h"
+
+#include "lingot-config.h"
+#include "lingot-mainframe.h"
+#include "lingot-config-dialog.h"
+#include "lingot-gauge.h"
+#include "lingot-i18n.h"
+
+#include "lingot-background.xpm"
+#include "lingot-logo.xpm"
+
+void lingot_mainframe_redraw(LingotMainFrame*);
+void lingot_mainframe_put_frequency(LingotMainFrame*);
+void lingot_mainframe_draw_gauge(LingotMainFrame*);
+void lingot_mainframe_draw_spectrum(LingotMainFrame*);
+
+GdkColor black_color;
+GdkColor gauge_color;
+GdkColor spectrum_background_color;
+GdkColor spectrum_color;
+GdkColor noise_threshold_color;
+GdkColor grid_color;
+GdkColor freq_color;
+
+// sizes
+
+int gauge_size_x = 160;
+int gauge_size_y = 100;
+
+int spectrum_size_y = 64;
+
+// spectrum area margins 
+int spectrum_bottom_margin = 16;
+int spectrum_top_margin = 12;
+int spectrum_x_margin = 15;
+
+GtkWidget* view_spectrum_item;
+GtkWidget* spectrum_frame;
+
+PangoFontDescription* spectrum_legend_font_desc;
+
+void lingot_mainframe_callback_redraw(GtkWidget* w, GdkEventExpose* e,
+		LingotMainFrame* frame) {
+	if (frame->core->running)
+		lingot_mainframe_redraw(frame);
+}
+
+void lingot_mainframe_callback_destroy(GtkWidget* w, LingotMainFrame* frame) {
+	if (frame->core->running) {
+		g_source_remove(frame->visualization_timer_uid);
+		g_source_remove(frame->calculation_timer_uid);
+		g_source_remove(frame->freq_timer_uid);
+		gtk_main_quit();
+	}
+}
+
+void lingot_mainframe_callback_about(GtkWidget* w, LingotMainFrame* frame) {
+	if (frame->core->running) {
+		static const gchar* authors[] = {
+				"Ibán Cereijo Graña <ibancg@gmail.com>",
+				"Jairo Chapela Martínez <jairochapela@gmail.com>", NULL };
+
+		const gchar* artists[] = { "Matthew Blissett (Logo design)", NULL };
+
+		gtk_show_about_dialog(NULL,
+		"name", "Lingot",
+		"version", VERSION,
+		"copyright", "\xC2\xA9 2004-2007 Ibán Cereijo Graña\n\xC2\xA9 2004-2007 Jairo Chapela Martínez",
+		"comments", _("Accurate and easy to use musical instrument tuner"),
+		"authors", authors,
+		"artists", artists,
+		"translator-credits", _("translator-credits"),
+		"logo-icon-name", "lingot-logo",
+		NULL);
+	}
+}
+
+void lingot_mainframe_callback_view_spectrum(GtkWidget* w,
+		LingotMainFrame* frame) {
+	if (!gtk_check_menu_item_get_active(GTK_CHECK_MENU_ITEM(view_spectrum_item))) {
+		gtk_widget_hide(spectrum_frame);
+	} else {
+		gtk_widget_show(spectrum_frame);
+	}
+}
+
+void lingot_mainframe_callback_config_dialog(GtkWidget* w,
+		LingotMainFrame* frame) {
+	if (frame->core->running) {
+		if (!frame->config_dialog) {
+			frame->config_dialog = lingot_config_dialog_new(frame);
+		} else {
+			// TODO: activate config dialog
+		}
+	}
+}
+
+/* Callback for visualization */
+gboolean lingot_mainframe_callback_visualization(gpointer data) {
+	unsigned int period;
+
+	LingotMainFrame* frame = (LingotMainFrame*) data;
+
+	if (frame->core->running) {
+		lingot_mainframe_draw_gauge(frame);
+
+		period = 1000/frame->conf->visualization_rate;
+		frame->visualization_timer_uid = g_timeout_add(period,
+				lingot_mainframe_callback_visualization, frame);
+	}
+
+	return 0;
+}
+
+/* Callback for calculation */
+gboolean lingot_mainframe_callback_calculation(gpointer data) {
+	unsigned int period;
+
+	LingotMainFrame* frame = (LingotMainFrame*) data;
+
+	if (frame->core->running) {
+		lingot_mainframe_draw_spectrum(frame);
+
+		period = 1000/frame->conf->calculation_rate;
+		frame->calculation_timer_uid = g_timeout_add(period,
+				lingot_mainframe_callback_calculation, frame);
+	}
+
+	return 0;
+}
+
+/* Callback for frequency calculation */
+gboolean lingot_mainframe_callback_frequency(gpointer data) {
+	unsigned int period;
+	LingotMainFrame* frame = (LingotMainFrame*) data;
+
+	if (frame->core->running) {
+		lingot_mainframe_put_frequency(frame);
+
+		period = 1000/GAUGE_RATE;
+		frame->freq_timer_uid = g_timeout_add(period,
+				lingot_mainframe_callback_frequency, frame);
+	}
+
+	return 0;
+}
+
+void lingot_mainframe_color(GdkColor* color, int red, int green, int blue) {
+	color->red = red;
+	color->green = green;
+	color->blue = blue;
+}
+
+LingotMainFrame* lingot_mainframe_new(int argc, char *argv[]) {
+	GtkWidget* vertical_box;
+	GtkWidget* horizontal_box;
+	GtkWidget* file_menu;
+	GtkWidget* edit_menu;
+	GtkWidget* help_menu;
+	GtkWidget* preferences_item;
+	GtkWidget* quit_item;
+	GtkWidget* about_item;
+	GtkAccelGroup* accel_group;
+	GtkWidget* menu_bar;
+	GtkWidget* file_item;
+	GtkWidget* edit_item;
+	GtkWidget* help_item;
+	GtkWidget* frame1;
+	GtkWidget* frame3;
+	GtkWidget* vbinfo;
+	LingotMainFrame* frame;
+	unsigned int period;
+
+	frame = malloc(sizeof(LingotMainFrame));
+
+	frame->config_dialog = NULL;
+	frame->pix_stick = NULL;
+
+	frame->conf = lingot_config_new();
+	lingot_config_load(frame->conf, CONFIG_FILE_NAME);
+
+	frame->gauge = lingot_gauge_new(frame->conf->vr); // gauge in rest situation	
+	frame->core = lingot_core_new(frame->conf);
+
+	// ----- FREQUENCY FILTER CONFIGURATION ------
+
+	// low pass IIR filter.
+	FLT freq_filter_a[] =
+	{	1.0, -0.5};
+	FLT freq_filter_b[] =
+	{	0.5};
+
+	frame->freq_filter= lingot_filter_new( 1, 0, freq_filter_a, freq_filter_b);
+
+	// ---------------------------------------------------
+
+	gtk_init(&argc, &argv);
+	gtk_set_locale();
+
+	// creates the window
+	frame->win = gtk_window_new(GTK_WINDOW_TOPLEVEL);
+	gtk_window_set_position(GTK_WINDOW(frame->win), GTK_WIN_POS_CENTER);
+
+	GdkPixbuf* logo = gdk_pixbuf_new_from_xpm_data(lingotlogo);
+	gtk_icon_theme_add_builtin_icon("lingot-logo", 64, logo);
+
+	gtk_window_set_icon(GTK_WINDOW(frame->win), logo);
+
+	//    g_object_unref(logo);
+
+	gtk_window_set_title(GTK_WINDOW(frame->win), _("lingot"));
+
+	gtk_container_set_border_width(GTK_CONTAINER(frame->win), 6);
+
+	// fixed size
+	gtk_window_set_resizable(GTK_WINDOW(frame->win), FALSE);
+	// tab organization by following container
+	vertical_box = gtk_vbox_new(FALSE, 0);
+	gtk_container_add(GTK_CONTAINER(frame->win), vertical_box);
+
+	file_menu = gtk_menu_new();
+	edit_menu = gtk_menu_new();
+	help_menu = gtk_menu_new();
+	GtkWidget* view_menu = gtk_menu_new();
+
+	accel_group = gtk_accel_group_new();
+
+	/* menu elements */
+	preferences_item = gtk_image_menu_item_new_from_stock(
+			GTK_STOCK_PREFERENCES, accel_group);
+	quit_item = gtk_image_menu_item_new_from_stock(GTK_STOCK_QUIT, accel_group);
+	about_item = gtk_image_menu_item_new_from_stock(GTK_STOCK_ABOUT,
+			accel_group);
+	view_spectrum_item= gtk_check_menu_item_new_with_label(_("Spectrum"));
+	gtk_check_menu_item_set_active(GTK_CHECK_MENU_ITEM(view_spectrum_item),
+			TRUE);
+
+	/* addition */
+	gtk_menu_append(GTK_MENU(file_menu), quit_item);
+	gtk_menu_append(GTK_MENU(edit_menu), preferences_item);
+	gtk_menu_append(GTK_MENU(view_menu), view_spectrum_item);
+	gtk_menu_append(GTK_MENU(help_menu), about_item);
+
+	gtk_widget_add_accelerator(preferences_item, "activate", accel_group, 'o',
+			GDK_CONTROL_MASK, GTK_ACCEL_VISIBLE);
+
+	gtk_widget_add_accelerator(quit_item, "activate", accel_group, 'q',
+			GDK_CONTROL_MASK, GTK_ACCEL_VISIBLE);
+
+	gtk_window_add_accel_group(GTK_WINDOW(frame->win), accel_group);
+
+	gtk_signal_connect(GTK_OBJECT(preferences_item), "activate",
+			GTK_SIGNAL_FUNC(lingot_mainframe_callback_config_dialog), frame);
+
+	gtk_signal_connect(GTK_OBJECT(quit_item), "activate",
+			GTK_SIGNAL_FUNC(lingot_mainframe_callback_destroy), frame);
+
+	gtk_signal_connect(GTK_OBJECT(about_item), "activate",
+			GTK_SIGNAL_FUNC(lingot_mainframe_callback_about), frame);
+
+	gtk_signal_connect(GTK_OBJECT(view_spectrum_item), "activate",
+			GTK_SIGNAL_FUNC(lingot_mainframe_callback_view_spectrum), frame);
+
+	menu_bar = gtk_menu_bar_new();
+	gtk_widget_show(menu_bar);
+	gtk_box_pack_start_defaults(GTK_BOX(vertical_box), menu_bar);
+
+	file_item = gtk_menu_item_new_with_mnemonic(_("_File"));
+	edit_item = gtk_menu_item_new_with_mnemonic(_("_Edit"));
+	GtkWidget* view_item = gtk_menu_item_new_with_mnemonic(_("_View"));
+	help_item = gtk_menu_item_new_with_mnemonic(_("_Help"));
+	gtk_menu_item_right_justify(GTK_MENU_ITEM(help_item));
+
+	gtk_menu_item_set_submenu(GTK_MENU_ITEM(file_item), file_menu);
+	gtk_menu_item_set_submenu(GTK_MENU_ITEM(edit_item), edit_menu);
+	gtk_menu_item_set_submenu(GTK_MENU_ITEM(view_item), view_menu);
+	gtk_menu_item_set_submenu(GTK_MENU_ITEM(help_item), help_menu);
+
+	gtk_menu_bar_append(GTK_MENU_BAR(menu_bar), file_item);
+	gtk_menu_bar_append(GTK_MENU_BAR(menu_bar), edit_item);
+	gtk_menu_bar_append(GTK_MENU_BAR(menu_bar), view_item);
+	gtk_menu_bar_append(GTK_MENU_BAR(menu_bar), help_item);
+
+#ifdef GTK12
+	gtk_menu_bar_set_shadow_type( GTK_MENU_BAR (menu_bar), GTK_SHADOW_NONE );
+#endif
+
+	////////////////////////////////////////////////////
+
+	// a fixed container to put the two upper frames in fixed positions
+	horizontal_box = gtk_hbox_new(FALSE, 0);
+	gtk_box_pack_start_defaults(GTK_BOX(vertical_box), horizontal_box);
+
+	// gauge frame
+	frame1 = gtk_frame_new(_("Deviation"));
+	//  gtk_fixed_put(GTK_FIXED(fix), frame1, 0, 0);
+	gtk_box_pack_start(GTK_BOX(horizontal_box), frame1, FALSE, FALSE, 0);
+
+	// note frame
+	frame3 = gtk_frame_new(_("Note"));
+	//gtk_fixed_put(GTK_BOX(hb), frame3, 164, 0);
+	gtk_box_pack_start(GTK_BOX(horizontal_box), frame3, TRUE, TRUE, 0);
+
+	// spectrum frame at bottom
+	spectrum_frame = gtk_frame_new(_("Spectrum"));
+	gtk_box_pack_end_defaults(GTK_BOX(vertical_box), spectrum_frame);
+
+	// for gauge drawing
+	frame->gauge_area = gtk_drawing_area_new();
+	gtk_widget_set_size_request(GTK_WIDGET(frame->gauge_area), gauge_size_x,
+			gauge_size_y);
+	gtk_container_add(GTK_CONTAINER(frame1), frame->gauge_area);
+
+	// for spectrum drawing
+	GtkObject* adjust = gtk_adjustment_new(0.0, 0.0, ((frame->conf->fft_size
+			> 256) ? 0.5 : 1.0)*frame->conf->sample_rate, 1.0, 100.0, 100.0);
+	frame->spectrum_scroll = GTK_SCROLLED_WINDOW(gtk_scrolled_window_new(
+			GTK_ADJUSTMENT(adjust), NULL));
+	frame->spectrum_area = gtk_drawing_area_new();
+
+	int
+			x = ((frame->conf->fft_size > 256) ? (frame->conf->fft_size >> 1)
+					: 256) + 2*spectrum_x_margin;
+	int y = spectrum_size_y + spectrum_bottom_margin + spectrum_top_margin;
+
+	gtk_widget_set_size_request(GTK_WIDGET(frame->spectrum_area), x, y);
+	gtk_scrolled_window_set_policy(frame->spectrum_scroll,
+			(frame->conf->fft_size > 512) ? GTK_POLICY_ALWAYS
+					: GTK_POLICY_NEVER, GTK_POLICY_NEVER);
+	gtk_scrolled_window_add_with_viewport(frame->spectrum_scroll,
+			frame->spectrum_area);
+	gtk_widget_set_size_request(GTK_WIDGET(frame->spectrum_scroll), 260 + 2
+			*spectrum_x_margin, spectrum_size_y + spectrum_bottom_margin
+			+ spectrum_top_margin + 4
+			+ ((frame->conf->fft_size > 512) ? 16 : 0));
+	gtk_container_add(GTK_CONTAINER(spectrum_frame),
+			GTK_WIDGET(frame->spectrum_scroll));
+
+	// for note and frequency displaying
+	vbinfo = gtk_vbox_new(FALSE, 0);
+	gtk_widget_set_size_request(GTK_WIDGET(vbinfo), 96 + 2*spectrum_x_margin,
+			gauge_size_y);
+	gtk_container_add(GTK_CONTAINER(frame3), vbinfo);
+
+	frame->freq_label = gtk_label_new(_("freq"));
+	gtk_box_pack_start_defaults(GTK_BOX(vbinfo), frame->freq_label);
+
+	frame->error_label = gtk_label_new(_("err"));
+	gtk_box_pack_end_defaults(GTK_BOX(vbinfo), frame->error_label);
+
+	frame->note_label = gtk_label_new(_("note"));
+	gtk_widget_set_name(frame->note_label, "label_nota");
+	gtk_box_pack_end_defaults(GTK_BOX(vbinfo), frame->note_label);
+
+	// show all
+	gtk_widget_show_all(frame->win);
+
+	// two pixmaps for double buffer in gauge and spectrum drawing 
+	// (virtual screen)
+	gdk_pixmap_new(frame->gauge_area->window, gauge_size_x, gauge_size_y, -1);
+	frame->pix_spectrum= gdk_pixmap_new(frame->spectrum_area->window, x, y, -1);
+
+	// GTK signals
+	gtk_signal_connect(GTK_OBJECT(frame->gauge_area), "expose_event",
+			GTK_SIGNAL_FUNC(lingot_mainframe_callback_redraw), frame);
+	gtk_signal_connect(GTK_OBJECT(frame->spectrum_area), "expose_event",
+			GTK_SIGNAL_FUNC(lingot_mainframe_callback_redraw), frame);
+	gtk_signal_connect(GTK_OBJECT(frame->win), "destroy",
+			GTK_SIGNAL_FUNC(lingot_mainframe_callback_destroy), frame);
+
+	period = 1000/frame->conf->visualization_rate;
+	frame->visualization_timer_uid = g_timeout_add(period,
+			lingot_mainframe_callback_visualization, frame);
+
+	period = 1000/frame->conf->calculation_rate;
+	frame->calculation_timer_uid = g_timeout_add(period,
+			lingot_mainframe_callback_calculation, frame);
+
+	period = 1000/GAUGE_RATE;
+	frame->freq_timer_uid = g_timeout_add(period,
+			lingot_mainframe_callback_frequency, frame);
+
+	lingot_mainframe_color(&gauge_color, 0xC000, 0x0000, 0x2000);
+	lingot_mainframe_color(&spectrum_background_color, 0x1111, 0x3333, 0x1111);
+	lingot_mainframe_color(&spectrum_color, 0x2222, 0xEEEE, 0x2222);
+	lingot_mainframe_color(&noise_threshold_color, 0x8888, 0x8888, 0x2222);
+	lingot_mainframe_color(&grid_color, 0x9000, 0x9000, 0x9000);
+	lingot_mainframe_color(&freq_color, 0xFFFF, 0x2222, 0x2222);
+
+	gdk_color_alloc(gdk_colormap_get_system(), &gauge_color);
+	gdk_color_alloc(gdk_colormap_get_system(), &spectrum_color);
+	gdk_color_alloc(gdk_colormap_get_system(), &spectrum_background_color);
+	gdk_color_alloc(gdk_colormap_get_system(), &noise_threshold_color);
+	gdk_color_alloc(gdk_colormap_get_system(), &grid_color);
+	gdk_color_alloc(gdk_colormap_get_system(), &freq_color);
+	gdk_color_black(gdk_colormap_get_system(), &black_color);
+
+	spectrum_legend_font_desc
+			=pango_font_description_from_string("Helvetica Plain 7");
+
+	return frame;
+}
+
+void lingot_mainframe_destroy(LingotMainFrame* frame) {
+	lingot_gauge_destroy(frame->gauge);
+	lingot_core_destroy(frame->core);
+	lingot_filter_destroy(frame->freq_filter);
+	lingot_config_destroy(frame->conf);
+	if (frame->config_dialog)
+		lingot_config_dialog_destroy(frame->config_dialog);
+
+	// pango_font_description_free(spectrum_legend_font_desc);
+	// gtk_widget_destroy(frame->freq_label);
+	// gtk_widget_destroy(frame->error_label);
+	// gtk_widget_destroy(frame->note_label);
+	// gtk_widget_destroy(frame->win);
+
+	// gdk_color_free(&gauge_color);
+	// gdk_color_free(&spectrum_color);
+	// gdk_color_free(&spectrum_background_color);
+	// gdk_color_free(&noise_threshold_color);
+	// gdk_color_free(&grid_color);
+	// gdk_color_free(&freq_color);
+
+	free(frame);
+}
+
+void lingot_mainframe_run(LingotMainFrame* frame) {
+	lingot_core_start(frame->core);
+	gtk_main();
+	lingot_core_stop(frame->core);
+	lingot_mainframe_destroy(frame);
+}
+// ---------------------------------------------------------------------------
+
+void lingot_mainframe_redraw(LingotMainFrame* frame) {
+	lingot_mainframe_draw_gauge(frame);
+	lingot_mainframe_draw_spectrum(frame);
+}
+
+// ---------------------------------------------------------------------------
+
+void lingot_mainframe_draw_gauge(LingotMainFrame* frame) {
+	GdkGC* gc = frame->gauge_area->style->fg_gc[frame->gauge_area->state];
+	GdkWindow* w = frame->gauge_area->window;
+	GdkGCValues gv;
+
+	gdk_gc_get_values(gc, &gv);
+
+	static FLT gauge_size = 90.0;
+	FLT max = 1.0;
+
+	// draws background
+	if (!frame->pix_stick) {
+		frame->pix_stick = gdk_pixmap_create_from_xpm_d(
+				frame->gauge_area->window, NULL, 
+				NULL, background2_xpm);
+	}
+	gdk_draw_pixmap(frame->gauge_area->window, gc, frame->pix_stick, 0, 0, 0,
+			0, 160, 100);
+
+	// and draws gauge
+	gdk_gc_set_foreground(gc, &gauge_color);
+
+	gdk_draw_line(w, gc, gauge_size_x >> 1, gauge_size_y - 1,
+			(gauge_size_x>> 1) + (int)rint(gauge_size
+					*sin(frame->gauge->position *M_PI/(1.5*max))), gauge_size_y
+					- 1- (int)rint(gauge_size *cos(frame->gauge->position*M_PI
+					/(1.5*max))));
+
+	// black edge.  
+	gdk_gc_set_foreground(gc, &black_color);
+	gdk_draw_rectangle(w, gc, FALSE, 0, 0, gauge_size_x - 1, gauge_size_y - 1);
+
+	gdk_draw_pixmap(frame->gauge_area->window, gc, w, 0, 0, 0, 0, gauge_size_x,
+			gauge_size_y);
+	gdk_flush();
+}
+
+void lingot_mainframe_draw_spectrum(LingotMainFrame* frame) {
+	PangoLayout* layout;
+
+	int
+			spectrum_size_x =
+					((frame->conf->fft_size > 256) ? (frame->conf->fft_size
+							>> 1) : 256);
+
+	// minimum grid size in pixels
+	static int minimum_grid_width = 50;
+
+	/* scale factors to draw the grid. We will choose the smaller factor that
+	 respects the minimum_grid_width */
+	static double
+			scales[] = { 0.01, 0.05, 0.1, 0.2, 0.5, 1, 2, 4, 11, 22, -1.0 };
+
+	// spectrum drawing mode
+	static gboolean spectrum_drawing_filled = TRUE;
+
+	// grid division in dB
+	static FLT grid_db_height = 25;
+
+	register unsigned int i;
+	int j;
+	int old_j;
+
+	GdkGC* gc = frame->spectrum_area->style->fg_gc[frame->spectrum_area->state];
+	GdkWindow* window = frame->pix_spectrum; //spectrum->window;
+	GdkGCValues gv;
+	gdk_gc_get_values(gc, &gv);
+
+	// clear all
+	gdk_gc_set_foreground(gc, &spectrum_background_color);
+	gdk_draw_rectangle(window, gc, TRUE, 0, 0, spectrum_size_x + 2
+			*spectrum_x_margin, spectrum_size_y + spectrum_bottom_margin
+			+ spectrum_top_margin);
+
+	gdk_gc_set_foreground(gc, &grid_color);
+
+	gdk_draw_line(window, gc, spectrum_x_margin, spectrum_size_y
+			+ spectrum_top_margin, spectrum_x_margin + spectrum_size_x,
+			spectrum_size_y + spectrum_top_margin);
+
+	// choose scale factor
+	for (i = 0; scales[i] > 0.0; i++) {
+		if ((1e3*scales[i]*frame->conf->fft_size*frame->conf->oversampling
+				/frame->conf->sample_rate) > minimum_grid_width)
+			break;
+	}
+
+	if (scales[i] < 0.0)
+		i--;
+
+	FLT scale = scales[i];
+
+	int grid_width = 1e3*scales[i]*frame->conf->fft_size
+			*frame->conf->oversampling/frame->conf->sample_rate;
+
+	char buff[10];
+
+	FLT freq = 0.0;
+	for (i = 0; i <= spectrum_size_x; i += grid_width) {
+		gdk_draw_line(window, gc, spectrum_x_margin + i, spectrum_top_margin,
+				spectrum_x_margin + i, spectrum_size_y + spectrum_top_margin
+						+ 3);
+
+		if (freq == 0.0) {
+			sprintf(buff, "0 Hz");
+		} else if (floor(freq) == freq)
+			sprintf(buff, "%0.0f kHz", freq);
+		else if (floor(10*freq) == 10*freq) {
+			if (freq <= 1000.0)
+				sprintf(buff, "%0.0f Hz", 1e3*freq);
+			else
+				sprintf(buff, "%0.1f kHz", freq);
+		} else {
+			if (freq <= 100.0)
+				sprintf(buff, "%0.0f Hz", 1e3*freq);
+			else
+				sprintf(buff, "%0.2f kHz", freq);
+		}
+
+		layout = gtk_widget_create_pango_layout(frame->spectrum_area, buff);
+		pango_layout_set_font_description(layout, spectrum_legend_font_desc);
+		gdk_draw_layout(window, gc, spectrum_x_margin - 8 + i, spectrum_size_y
+				+ spectrum_top_margin + 5, layout);
+		freq += scale;
+	}
+
+# define PLOT_GAIN  8
+
+	sprintf(buff, "dB");
+
+	layout = gtk_widget_create_pango_layout(frame->spectrum_area, buff);
+	pango_layout_set_font_description(layout, spectrum_legend_font_desc);
+	gdk_draw_layout(window, gc, spectrum_x_margin - 6, 2, layout);
+
+	int grid_height = (int) (PLOT_GAIN*log10(pow(10.0, grid_db_height/10.0))); // dB.
+	j = 0;
+	for (i = 0; i <= spectrum_size_y; i += grid_height) {
+		if (j == 0)
+			sprintf(buff, " %i", j);
+		else
+			sprintf(buff, "%i", j);
+
+		layout = gtk_widget_create_pango_layout(frame->spectrum_area, buff);
+		pango_layout_set_font_description(layout, spectrum_legend_font_desc);
+		gdk_draw_layout(window, gc, 2, spectrum_size_y + spectrum_top_margin
+				- i - 5, layout);
+
+		gdk_draw_line(window, gc, spectrum_x_margin, spectrum_size_y
+				+ spectrum_top_margin - i, spectrum_x_margin + spectrum_size_x,
+				spectrum_size_y + spectrum_top_margin - i);
+
+		j += grid_db_height;
+	}
+
+	gdk_gc_set_foreground(gc, &noise_threshold_color);
+
+	// noise threshold drawing.
+	j = -1;
+	for (i = 0; (i < frame->conf->fft_size) && (i < spectrum_size_x); i++) {
+		if ((i % 10) > 5)
+			continue;
+
+		FLT w = 2*M_PI*i/frame->conf->fft_size;
+		//FLT noise = pow(10.0, (frame->conf->noise_threshold_db*(1.0 - 0.9*w/M_PI))/10.0);
+		//FLT noise = lingot_signal_get_noise_threshold(frame->conf, w);
+		FLT noise = frame->conf->noise_threshold_nu;
+		old_j = j;
+		j = (noise > 1.0) ? (int) (PLOT_GAIN*log10(noise)) : 0; // dB.
+		if ((old_j >= 0) && (old_j < spectrum_size_y)&& (j >= 0)&& (j
+				< spectrum_size_y))
+			gdk_draw_line(window, gc, spectrum_x_margin + i - 1,
+					spectrum_size_y + spectrum_top_margin - old_j,
+					spectrum_x_margin + i, spectrum_size_y
+							+ spectrum_top_margin - j);
+	}
+
+	gdk_gc_set_foreground(gc, &spectrum_color);
+
+	// spectrum drawing.
+	j = -1;
+	for (i = 0; (i < frame->conf->fft_size - 1) && (i < spectrum_size_x - 1); i++) {
+		old_j = j;
+		j = (frame->core->X[i] > 1.0) ? (int) (PLOT_GAIN*log10(frame->core->X[i])) : 0; // dB.
+		if (spectrum_drawing_filled) {
+			if (j < spectrum_size_y)
+				gdk_draw_line(window, gc, spectrum_x_margin + i,
+						spectrum_size_y + spectrum_top_margin - 1,
+						spectrum_x_margin + i, spectrum_top_margin + ((j
+								< spectrum_size_y) ? (spectrum_size_y - j) : 0));
+		} else if ((old_j >= 0) && (old_j < spectrum_size_y)&& (j >= 0)&& (j
+				< spectrum_size_y))
+			gdk_draw_line(window, gc, spectrum_x_margin + i - 1,
+					spectrum_size_y + spectrum_top_margin - old_j,
+					spectrum_x_margin + i, spectrum_size_y
+							+ spectrum_top_margin - j);
+	}
+
+	if (frame->core->freq != 0.0) {
+
+		// fundamental frequency mark with a red point. 
+		gdk_gc_set_foreground(gc, &freq_color);
+
+		// index of closest sample to fundamental frequency.
+		i = (int) rint(frame->core->freq*frame->conf->fft_size
+				*frame->conf->oversampling/frame->conf->sample_rate);
+		if ((i < frame->conf->fft_size - 1) && (i < spectrum_size_x - 1)) {
+			j = (frame->core->X[i] > 1.0) ? (int) (PLOT_GAIN*log10(frame->core->X[i])) : 0; // dB.
+			if (j < spectrum_size_y - 1)
+				gdk_draw_rectangle(window, gc, TRUE, spectrum_x_margin + i-1,
+						spectrum_size_y + spectrum_top_margin - j - 1, 3, 3);
+		}
+	}
+
+# undef  PLOT_GAIN
+
+	gdk_gc_set_foreground(gc, &black_color);
+
+	gdk_draw_pixmap(frame->spectrum_area->window, gc, window, 0, 0, 0, 0,
+			spectrum_size_x + 2*spectrum_x_margin, spectrum_size_y
+					+ spectrum_bottom_margin + spectrum_top_margin);
+	gdk_flush();
+}
+
+void lingot_mainframe_put_frequency(LingotMainFrame* frame) {
+	// note indexation by semitone.
+	static char* note_string[] = { "A", "A#", "B", "C", "C#", "D", "D#", "E",
+			"F", "F#", "G", "G#" };
+	const FLT Log2 = log(2.0);
+
+	FLT fret_f;
+	int fret;
+	char* current_note;
+	char labeltext_current_note[100];
+
+	static char error_string[30], freq_string[30];
+
+	LingotCore* core1 = frame->core;
+
+	// ignore continuous component
+	if (isnan(frame->core->freq) || (frame->core->freq < 10.0)) {
+		current_note = "---";
+		strcpy(error_string, "e = ---");
+		strcpy(freq_string, "f = ---");
+		lingot_gauge_compute(frame->gauge, frame->conf->vr);
+	} else {
+		// bring up some octaves to avoid negative frets.
+		fret_f = log(frame->core->freq/frame->conf->root_frequency)/Log2*12.0
+				+ 12e2;
+
+		lingot_gauge_compute(frame->gauge, fret_f - rint(fret_f));
+		fret = ((int) rint(fret_f)) % 12;
+
+		current_note = note_string[fret];
+		sprintf(error_string, "e = %+4.2f%%", frame->gauge->position*100.0);
+		sprintf(freq_string, "f = %6.2f Hz", lingot_filter_filter_sample(
+				frame->freq_filter, frame->core->freq));
+	}
+
+	gtk_label_set_text(GTK_LABEL(frame->freq_label), freq_string);
+	gtk_label_set_text(GTK_LABEL(frame->error_label), error_string);
+
+	char* markup = g_markup_printf_escaped(
+			"<span size=\"xx-large\" weight=\"bold\">%s</span>", current_note);
+	gtk_label_set_markup(GTK_LABEL(frame->note_label), markup);
+	g_free(markup);
+}
+
+void lingot_mainframe_change_config(LingotMainFrame* frame, LingotConfig* conf) {
+	lingot_core_stop(frame->core);
+	lingot_core_destroy(frame->core);
+
+	// dup.
+	*frame->conf = *conf;
+
+	// resize spectrum area
+	g_object_unref(frame->pix_spectrum);
+
+	int
+			x = ((frame->conf->fft_size > 256) ? (frame->conf->fft_size >> 1)
+					: 256) + 2*spectrum_x_margin;
+	int y = spectrum_size_y + spectrum_top_margin + spectrum_bottom_margin;
+	gtk_widget_set_size_request(GTK_WIDGET(frame->spectrum_area), x, y);
+	frame->pix_spectrum= gdk_pixmap_new(frame->spectrum_area->window, x, y, -1);
+
+	gtk_scrolled_window_set_policy(frame->spectrum_scroll,
+			(frame->conf->fft_size > 512) ? GTK_POLICY_ALWAYS
+					: GTK_POLICY_NEVER, GTK_POLICY_NEVER);
+	gtk_widget_set_size_request(GTK_WIDGET(frame->spectrum_scroll), 260 + 2
+			*spectrum_x_margin, spectrum_size_y + spectrum_bottom_margin
+			+ spectrum_top_margin + 4
+			+ ((frame->conf->fft_size > 512) ? 16 : 0));
+
+	frame->core = lingot_core_new(frame->conf);
+	lingot_core_start(frame->core);
+}
diff --git a/src/lingot-mainframe.h b/src/lingot-mainframe.h
new file mode 100644
index 0000000..8e4dd08
--- /dev/null
+++ b/src/lingot-mainframe.h
@@ -0,0 +1,82 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_MAIN_FRAME_H__
+#define __LINGOT_MAIN_FRAME_H__
+
+#include "lingot-defs.h"
+#include "lingot-core.h"
+#include "lingot-gauge.h"
+#include "lingot-config.h"
+#include "lingot-config-dialog.h"
+#include "lingot-filter.h"
+
+#include <gtk/gtk.h>
+
+// Window that contains all controls, graphics, etc. of the tuner.
+
+//typedef struct _LingotMainFrame LingotMainFrame;
+
+struct _LingotMainFrame
+  {
+
+    // gtk widgets
+    GtkWidget* gauge_area;
+    GtkWidget* spectrum_area;
+    GtkWidget* note_label;
+
+    GtkWidget* freq_label;
+    GtkWidget* error_label;
+
+    GdkPixmap* pix_spectrum;
+    GdkPixmap* pix_stick;
+
+    GtkScrolledWindow* spectrum_scroll;
+    
+    LingotFilter* freq_filter;
+
+    LingotGauge* gauge;
+
+    LingotCore* core;
+
+    GtkWidget* win;
+
+    GdkColor gauge_color;
+    GdkColor spectrum_color;
+
+    LingotConfigDialog* config_dialog;
+    LingotConfig* conf;
+
+    // timer uids
+    guint visualization_timer_uid;
+    guint calculation_timer_uid;
+    guint freq_timer_uid;
+  };
+
+LingotMainFrame* lingot_mainframe_new(int argc, char *argv[]);
+void lingot_mainframe_destroy(LingotMainFrame*);
+
+void lingot_mainframe_run(LingotMainFrame*);
+void lingot_mainframe_change_config(LingotMainFrame*, LingotConfig*);
+
+#endif //__LINGOT_MAIN_FRAME_H__
diff --git a/src/lingot-signal.c b/src/lingot-signal.c
new file mode 100644
index 0000000..e675216
--- /dev/null
+++ b/src/lingot-signal.c
@@ -0,0 +1,153 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <math.h>
+
+#include "lingot-signal.h"
+
+/*
+ peak identification functions.
+ */
+
+FLT lingot_signal_get_noise_threshold(LingotConfig* conf, FLT w)
+{
+	//return 0.5*(1.0 - 0.9*w/M_PI);
+	return pow(10.0, (conf->noise_threshold_db*(1.0 - 0.9*w/M_PI))/10.0);
+	//return conf->noise_threshold_un;
+}
+
+//---------------------------------------------------------------------------
+
+/* returns the index of the maximun of the buffer x of size N */
+void lingot_signal_get_max(FLT *x, int N, int* Mi) {
+	register int i;
+	FLT M;
+
+	M = -1.0;
+	*Mi = -1;
+
+	for (i = 0; i < N; i++) {
+
+		if (x[i] > M) {
+			M = x[i];
+			*Mi = i;
+		}
+	}
+}
+
+//---------------------------------------------------------------------------
+
+int lingot_signal_is_peak(LingotConfig* conf, FLT* x, int index) {
+	register unsigned int j;
+	//static   FLT  delta_w_FFT = 2.0*M_PI/conf->FFT_SIZE; // resolution in rads
+
+	// a peak must be greater than noise threshold.
+	if (x[index] < conf->noise_threshold_nu)
+		return 0;
+
+	for (j = 0; j < conf->peak_order; j++) {
+		if (x[index + j] < x[index + j + 1])
+			return 0;
+		if (x[index - j] < x[index - j - 1])
+			return 0;
+	}
+	return 1;
+}
+
+//---------------------------------------------------------------------------
+
+// search the fundamental peak given the spd and its 2nd derivative
+int lingot_signal_get_fundamental_peak(LingotConfig* conf, FLT *x, FLT* d2x,
+		int N) {
+	register unsigned int i, j, m;
+	int p_index[conf->peak_number];
+
+	// at this moment there is no peaks.
+	for (i = 0; i < conf->peak_number; i++)
+		p_index[i] = -1;
+
+	unsigned int lowest_index = (unsigned int)ceil(conf->min_frequency*(1.0
+			*conf->oversampling/conf->sample_rate)*conf->fft_size);
+
+	if (lowest_index < conf->peak_order)
+		lowest_index = conf->peak_order;
+
+	// I'll get the PEAK_NUMBER maximum peaks.
+	for (i = lowest_index; i < N - conf->peak_order; i++)
+		if (lingot_signal_is_peak(conf, x, i)) {
+
+			// search a place in the maximums buffer, if it doesn't exists, the
+			// lower maximum is candidate to be replaced.
+			m = 0; // first candidate.
+			for (j = 0; j < conf->peak_number; j++) {
+				if (p_index[j] == -1) {
+					m = j; // there is a place.
+					break;
+				}
+
+				if (d2x[p_index[j]] < d2x[p_index[m]])
+					m = j; // search the lowest.
+			}
+
+			if (p_index[m] == -1)
+				p_index[m] = i; // there is a place
+			else if (d2x[i] > d2x[p_index[m]])
+				p_index[m] = i; // if greater
+		}
+
+	FLT maximum = 0.0;
+	int maximum_index = -1;
+
+	// search the maximum peak
+	for (i = 0; i < conf->peak_number; i++)
+		if ((p_index[i] != -1) && (x[p_index[i]] > maximum)) {
+			maximum = x[p_index[i]];
+			maximum_index = p_index[i];
+		}
+
+	if (maximum_index == -1)
+		return N;
+
+	// all peaks much lower than maximum are deleted.
+	for (i = 0; i < conf->peak_number; i++)
+		if ((p_index[i] == -1) ||(conf->peak_rejection_relation_nu
+				*x[p_index[i]] < maximum))
+			p_index[i] = N; // there are available places in the buffer.
+
+	// search the lowest maximum index.
+	for (m = 0, j = 0; j < conf->peak_number; j++) {
+		if (p_index[j] < p_index[m])
+			m = j;
+	}
+
+	return p_index[m];
+}
+
+//---------------------------------------------------------------------------
+
+// generates a Hamming window of N samples
+void lingot_signal_hamming_window(int N, FLT* out) {
+	register int i;
+	for (i = 0; i < N; i++)
+		out[i] = 0.53836 - 0.46164*cos((2.0*M_PI*i)/(N-1));
+}
diff --git a/src/lingot-signal.h b/src/lingot-signal.h
new file mode 100644
index 0000000..7092f92
--- /dev/null
+++ b/src/lingot-signal.h
@@ -0,0 +1,49 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#ifndef __LINGOT_SIGNAL_H__
+#define __LINGOT_SIGNAL_H__
+
+/*
+ peak identification functions.
+ */
+
+#include "lingot-defs.h"
+#include "lingot-config.h"
+
+// returns noise threshold at a given frequency w.
+FLT lingot_signal_get_noise_threshold(LingotConfig*, FLT w);
+
+// returns if buffer has a peak at given index
+int lingot_signal_is_peak(LingotConfig*, FLT* buffer, int index);
+
+// returns the maximum index.
+void lingot_signal_get_max(FLT *buffer, int N, int* Mi);
+
+// returns the index of the peak that carries the fundamental freq.
+int lingot_signal_get_fundamental_peak(LingotConfig*, FLT *x, FLT* y, int N);
+
+// generates a Hamming window of N samples
+void lingot_signal_hamming_window(int N, FLT* out);
+
+#endif /*__LINGOT_SIGNAL_H__*/
diff --git a/src/lingot.c b/src/lingot.c
new file mode 100644
index 0000000..4da9f53
--- /dev/null
+++ b/src/lingot.c
@@ -0,0 +1,132 @@
+//-*- C++ -*-
+/*
+ * lingot, a musical instrument tuner.
+ *
+ * Copyright (C) 2004-2007  Ibán Cereijo Graña, Jairo Chapela Martínez.
+ *
+ * This file is part of lingot.
+ *
+ * lingot is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * lingot is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with lingot; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <getopt.h>
+
+#include "lingot-defs.h"
+#include "lingot-config.h"
+#include "lingot-mainframe.h"
+#include "lingot-i18n.h"
+
+char CONFIG_FILE_NAME[100];
+
+int main(int argc, char *argv[])
+  {
+
+#ifdef ENABLE_NLS	
+    bindtextdomain (GETTEXT_PACKAGE, LINGOT_LOCALEDIR);
+    bind_textdomain_codeset (GETTEXT_PACKAGE, "UTF-8");
+    textdomain (GETTEXT_PACKAGE);
+#endif
+
+    // default config file.
+    sprintf(CONFIG_FILE_NAME, "%s/" CONFIG_DIR_NAME DEFAULT_CONFIG_FILE_NAME,
+        getenv("HOME"));
+
+    // TODO: indicate complete config file path
+    if ((argc > 3) || (argc == 2))
+      {
+        printf("\nusage: lingot [-c config]\n\n");
+        return -1;
+      }
+    else if (argc > 1)
+      {
+        int c;
+        int digit_optind = 0;
+
+        while (1)
+          {
+            int this_option_optind = optind ? optind : 1;
+            int option_index = 0;
+            static struct option long_options[] =
+              {
+                  { "config", 1, 0, 'c'},
+                  { 0, 0, 0, 0}
+              };
+
+            c = getopt_long (argc, argv, "c:",
+                long_options, &option_index);
+            if (c == -1)
+            break;
+
+            switch (c)
+              {
+                case 'c':
+                sprintf(CONFIG_FILE_NAME, "%s/%s%s.conf", getenv("HOME"),
+                    CONFIG_DIR_NAME, optarg);
+                printf("using config file %s\n", CONFIG_FILE_NAME);
+                break;
+
+                case '?':
+                break;
+
+                default:
+                printf ("?? getopt returned character code 0%o ??\n", c);
+              }
+          }
+
+        /*        if (strcmp(argv[1], "-c") || (argc < 3))
+         {
+         printf("invalid argument\n");
+         return -1;
+         }
+
+         sprintf(CONFIG_FILE_NAME, "%s/%s%s.conf", getenv("HOME"),
+         CONFIG_DIR_NAME, argv[2]);
+         printf("using config file %s\n", CONFIG_FILE_NAME);*/
+      }
+
+    // if config file doesn't exists, i will create it.
+    FILE* fp;
+    if ((fp = fopen(CONFIG_FILE_NAME, "r")) == NULL)
+      {
+
+        char config_dir[100];
+        sprintf(config_dir, "%s/.lingot/", getenv("HOME"));
+        printf("creating directory %s ...\n", config_dir);
+        mkdir(config_dir, 0777); // creo el directorio.
+        printf("creating file %s ...\n", CONFIG_FILE_NAME);
+
+        // new configuration with default values.
+        LingotConfig* new_conf = lingot_config_new();
+        lingot_config_save(new_conf, CONFIG_FILE_NAME);
+        lingot_config_destroy(new_conf);
+
+        printf("ok\n");
+
+      }
+    else
+    fclose(fp);
+
+    LingotMainFrame* gui = lingot_mainframe_new(argc, argv);
+    lingot_mainframe_run(gui);
+
+    return 0;
+  }