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diff --git a/sc4pd/source/DelayUnit.hpp b/sc4pd/source/DelayUnit.hpp
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+/* sc4pd 
+   public class for several delay objects
+
+   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:
+   
+*/
+
+//#include "sc4pd.hpp"
+
+class DelayUnit_ar 
+    : public sc4pd_dsp
+{
+    FLEXT_HEADER(DelayUnit_ar,sc4pd_dsp);
+    
+public:
+    /* functions */
+    void DelayUnit_AllocDelayLine();
+    void DelayUnit_Reset();  
+    float CalcDelay(float delaytime);
+    void DelayUnit_Dtor();
+
+    /* data */
+    float *m_dlybuf;
+    float m_dsamp, m_fdelaylen;
+    float m_delaytime, m_maxdelaytime;
+    long m_iwrphase, m_idelaylen, m_mask;
+    long m_numoutput;
+};
+
+/* todo: a delay for control messages? */
+
+class FeedbackDelay_ar : public DelayUnit_ar
+{
+    FLEXT_HEADER(FeedbackDelay_ar,DelayUnit_ar);
+    float m_feedbk, m_decaytime;
+    void FeedbackDelay_Reset();
+};