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diff --git a/intern/audaspace/FX/AUD_ButterworthReader.h b/intern/audaspace/FX/AUD_ButterworthReader.h
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+++ b/intern/audaspace/FX/AUD_ButterworthReader.h
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+/*
+ * $Id$
+ *
+ * ***** BEGIN LGPL LICENSE BLOCK *****
+ *
+ * Copyright 2009 Jörg Hermann Müller
+ *
+ * This file is part of AudaSpace.
+ *
+ * AudaSpace is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * AudaSpace 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with AudaSpace.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ * ***** END LGPL LICENSE BLOCK *****
+ */
+
+#ifndef AUD_BUTTERWORTHREADER
+#define AUD_BUTTERWORTHREADER
+
+#include "AUD_EffectReader.h"
+class AUD_Buffer;
+
+/**
+ * This class represents a butterworth filter.
+ */
+class AUD_ButterworthReader : public AUD_EffectReader
+{
+private:
+	/**
+	 * The playback buffer.
+	 */
+	AUD_Buffer *m_buffer;
+
+	/**
+	 * The last out values buffer.
+	 */
+	AUD_Buffer *m_outvalues;
+
+	/**
+	 * The last in values buffer.
+	 */
+	AUD_Buffer *m_invalues;
+
+	/**
+	 * The position for buffer cycling.
+	 */
+	int m_position;
+
+	/**
+	 * Filter coefficients.
+	 */
+	float m_coeff[2][5];
+
+public:
+	/**
+	 * Creates a new butterworth reader.
+	 * \param reader The reader to read from.
+	 * \param attack The attack value in seconds.
+	 * \param release The release value in seconds.
+	 * \param threshold The threshold value.
+	 * \param arthreshold The attack/release threshold value.
+	 * \exception AUD_Exception Thrown if the reader specified is NULL.
+	 */
+	AUD_ButterworthReader(AUD_IReader* reader, float frequency);
+
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~AUD_ButterworthReader();
+
+	virtual void read(int & length, sample_t* & buffer);
+};
+
+#endif //AUD_BUTTERWORTHREADER