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diff --git a/attic/muse_qt4_evolution/synti/zynaddsubfx/DSP/SVFilter.h b/attic/muse_qt4_evolution/synti/zynaddsubfx/DSP/SVFilter.h
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+++ b/attic/muse_qt4_evolution/synti/zynaddsubfx/DSP/SVFilter.h
@@ -0,0 +1,67 @@
+/*
+  ZynAddSubFX - a software synthesizer
+ 
+  SV Filter.h - Several state-variable 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 SV_FILTER_H
+#define SV_FILTER_H
+
+#include "../globals.h"
+#include "Filter_.h"
+class SVFilter:public Filter_{
+ public:
+    SVFilter(unsigned char Ftype,REALTYPE Ffreq, REALTYPE Fq,unsigned char Fstages);
+    ~SVFilter();	
+    void filterout(REALTYPE *smp);
+    void setfreq(REALTYPE frequency);
+    void setfreq_and_q(REALTYPE frequency,REALTYPE q_);
+    void setq(REALTYPE q_);
+
+    void settype(int type_);
+    void setgain(REALTYPE dBgain);
+    void setstages(int stages_);
+    void cleanup();
+
+ private:
+    struct fstage{
+      REALTYPE low,high,band,notch;
+    } st[MAX_FILTER_STAGES+1];
+
+    struct parameters{
+	REALTYPE f,q,q_sqrt;
+    }par,ipar;
+
+
+    void singlefilterout(REALTYPE *smp,fstage &x,parameters &par);
+    void computefiltercoefs();
+    int type;//The type of the filter (LPF1,HPF1,LPF2,HPF2...)
+    int stages;//how many times the filter is applied (0->1,1->2,etc.)
+    REALTYPE freq;//Frequency given in Hz
+    REALTYPE q; //Q factor (resonance or Q factor)
+    REALTYPE gain;//the gain of the filter (if are shelf/peak) filters
+    
+    int abovenq;//this is 1 if the frequency is above the nyquist
+    int oldabovenq;
+    int needsinterpolation,firsttime;
+};
+
+
+#endif
+