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diff --git a/sc4pd/source/sc4pd.hpp b/sc4pd/source/sc4pd.hpp
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+/* sc4pd: 
+   support functions
+   
+   Copyright (c) 2004 Tim Blechmann.                                       
+
+   This code is derived from:
+	SuperCollider real time audio synthesis system
+    Copyright (c) 2002 James McCartney. All rights reserved.
+	http://www.audiosynth.com
+
+   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.
+
+   Based on:
+     PureData by Miller Puckette and others.
+         http://www.crca.ucsd.edu/~msp/software.html
+     FLEXT by Thomas Grill
+         http://www.parasitaere-kapazitaeten.net/ext
+     SuperCollider by James McCartney
+         http://www.audiosynth.com
+     
+   Coded while listening to: Morton Feldman: For John Cage
+   
+*/
+
+#ifndef _SC4PD_HPP
+
+#include <flext.h>
+
+#if !defined(FLEXT_VERSION) || (FLEXT_VERSION < 406)
+#error You need at least FLEXT version 0.4.6
+#endif
+
+#include "SC_PlugIn.h"
+#include "support.hpp"
+
+/* this macro has to be redefined to work with flext */
+
+// calculate a slope for control rate interpolation to audio rate.
+//#define CALCSLOPE(next,prev) ((next - prev) * unit->mRate->mSlopeFactor)
+#undef CALCSLOPE
+#define CALCSLOPE(next,prev) ((next - prev) * 1/ Blocksize())
+
+
+
+//#define SAMPLERATE (unit->mRate->mSampleRate)
+#undef SAMPLERATE
+#define SAMPLERATE Samplerate()
+
+//#define BUFLENGTH (unit->mBufLength)
+#undef BUFLENGTH
+#define BUFLENGTH Blocksize()
+
+/* to make sure the behaviour is consistent: */
+
+#undef ZXP
+#define ZXP(z) (*(z)++)
+
+
+
+class sc4pd_dsp 
+    : public flext_dsp
+{
+    FLEXT_HEADER(sc4pd_dsp,flext_dsp);
+
+
+/* some initialisation functions, adapted from SC_Rate.cpp*/
+
+    inline float sc_sampledur()
+    {
+	return 1 / Samplerate();
+    }
+    
+    inline float sc_radianspersample()
+    {
+	return twopi / Samplerate();
+    }
+    
+    inline float sc_bufduration()
+    {
+	return Blocksize() / Samplerate();
+    }
+    
+    inline float sc_bufrate()
+    {
+	return 1 / sc_bufduration();
+    }
+    
+    inline float sc_slopefactor()
+    {
+	return 1 / Blocksize();
+    }
+    
+    inline int sc_filterloops()
+    {
+	return Blocksize() / 3;
+    }
+    
+    inline int sc_filterremain()
+    {
+	return Blocksize() % 3;
+    }
+    
+    inline float sc_filterslope()
+    {
+	float f = sc_filterloops();
+	if (f == 0)
+	    return 0;
+	else
+	    return 1. / f;
+    }
+
+};
+
+    
+#define _SC4PD_HPP
+#endif