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diff --git a/muse2/synti/deicsonze2/deicsonzefilter.h b/muse2/synti/deicsonze2/deicsonzefilter.h
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+//===========================================================================
+//
+//    DeicsOnze an emulator of the YAMAHA DX11 synthesizer
+//
+//    Version 0.5.5
+//
+//    deicsonzefilter.h
+//
+//
+//  Copyright (c) 2004-2006 Nil Geisweiller
+//
+//
+//
+// This program 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.
+//
+// This program 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 this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
+// 02111-1307, USA or point your web browser to http://www.gnu.org.
+//===========================================================================
+
+#ifndef __DEICSONZEFILTER_H
+#define __DEICSONZEFILTER_H
+
+#include <math.h>
+
+class LowFilter {
+ private:
+  int _samplerate;
+
+  double _cutoff; //frequency cutoff
+  float _a;
+  float _b;
+
+  float _li; //last left input sample
+  float _ri; //last right input sample
+  float _lo; //last left output sample
+  float _ro; //last right output sample
+ public:
+  LowFilter();
+  ~LowFilter() {}
+
+  void setSamplerate(int sr);
+  void setCutoff(double cut);
+  //int getSamplerate();
+  //double getCutoff();
+
+  void process(float* leftSamples, float* RightSamples, unsigned n);
+};
+
+#endif /* __DEICSONZEFILTER_H */