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diff --git a/muse_qt4_evolution/synti/zynaddsubfx/DSP/Filter.h b/muse_qt4_evolution/synti/zynaddsubfx/DSP/Filter.h
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+++ b/muse_qt4_evolution/synti/zynaddsubfx/DSP/Filter.h
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+/*
+  ZynAddSubFX - a software synthesizer
+ 
+  Filter.h - Filters, uses analog,formant,etc. filters
+  Copyright (C) 2002-2005 Nasca Octavian Paul
+  Author: Nasca Octavian Paul
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of version 2 of the GNU General Public License 
+  as published by the Free Software Foundation.
+
+  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 (version 2) for more details.
+
+  You should have received a copy of the GNU General Public License (version 2)
+  along with this program; if not, write to the Free Software Foundation,
+  Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+
+*/
+
+#ifndef FILTER_H
+#define FILTER_H
+
+#include "../globals.h"
+
+#include "Filter_.h"
+#include "AnalogFilter.h"
+#include "FormantFilter.h"
+#include "SVFilter.h"
+#include "../Params/FilterParams.h"
+
+class Filter{
+ public:
+    Filter(FilterParams *pars);
+    ~Filter();	
+    void filterout(REALTYPE *smp);
+    void setfreq(REALTYPE frequency);
+    void setfreq_and_q(REALTYPE frequency,REALTYPE q_);
+    void setq(REALTYPE q_);
+
+    REALTYPE getrealfreq(REALTYPE freqpitch);
+ private:
+    Filter_ *filter;
+    unsigned char category;
+};
+
+
+#endif
+