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diff --git a/src/lingot-config.h b/src/lingot-config.h
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+//-*- 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__