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diff --git a/src/lingot-gauge.h b/src/lingot-gauge.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_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__*/