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diff --git a/libs/rubberband/src/PercussiveAudioCurve.h b/libs/rubberband/src/PercussiveAudioCurve.h
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+++ b/libs/rubberband/src/PercussiveAudioCurve.h
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+/* -*- c-basic-offset: 4 indent-tabs-mode: nil -*-  vi:set ts=8 sts=4 sw=4: */
+
+/*
+    Rubber Band
+    An audio time-stretching and pitch-shifting library.
+    Copyright 2007-2008 Chris Cannam.
+    
+    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.  See the file
+    COPYING included with this distribution for more information.
+*/
+
+#ifndef _PERCUSSIVE_AUDIO_CURVE_H_
+#define _PERCUSSIVE_AUDIO_CURVE_H_
+
+#include "AudioCurve.h"
+
+namespace RubberBand
+{
+
+class PercussiveAudioCurve : public AudioCurve
+{
+public:
+    PercussiveAudioCurve(size_t sampleRate, size_t windowSize);
+
+    virtual ~PercussiveAudioCurve();
+
+    virtual void setWindowSize(size_t newSize);
+
+    virtual float process(const float *R__ mag, size_t increment);
+    virtual float process(const double *R__ mag, size_t increment);
+    virtual void reset();
+
+protected:
+    float *R__ m_prevMag;
+};
+
+}
+
+#endif