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diff --git a/muse_qt4_evolution/synti/zynaddsubfx/DSP/AnalogFilter.h b/muse_qt4_evolution/synti/zynaddsubfx/DSP/AnalogFilter.h
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+/*
+  ZynAddSubFX - a software synthesizer
+ 
+  Analog Filter.h - Several analog filters (lowpass, highpass...)
+  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 ANALOG_FILTER_H
+#define ANALOG_FILTER_H
+
+#include "../globals.h"
+#include "Filter_.h"
+class AnalogFilter:public Filter_{
+ public:
+    AnalogFilter(unsigned char Ftype,REALTYPE Ffreq, REALTYPE Fq,unsigned char Fstages);
+    ~AnalogFilter();	
+    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();
+    
+    REALTYPE H(REALTYPE freq);//Obtains the response for a given frequency
+    
+ private:
+    struct fstage{
+      REALTYPE c1,c2;
+    } x[MAX_FILTER_STAGES+1],y[MAX_FILTER_STAGES+1],
+      oldx[MAX_FILTER_STAGES+1],oldy[MAX_FILTER_STAGES+1];
+
+    void singlefilterout(REALTYPE *smp,fstage &x,fstage &y,REALTYPE *c,REALTYPE *d);
+    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 order;//the order of the filter (number of poles)
+
+    REALTYPE c[3],d[3];//coefficients
+
+    REALTYPE oldc[3],oldd[3];//old coefficients(used only if some filter paremeters changes very fast, and it needs interpolation)
+
+    REALTYPE xd[3],yd[3];//used if the filter is applied more times
+    int needsinterpolation,firsttime;
+    int abovenq;//this is 1 if the frequency is above the nyquist
+    int oldabovenq;//if the last time was above nyquist (used to see if it needs interpolation)
+};
+
+
+#endif
+