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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
+   
+*/
+
+#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())
+
+
+
+
+/* to make sure the behaviour is consistent: */
+
+#undef ZXP
+#define ZXP(z) (*(z)++)
+