diff --git a/intern/audaspace/FX/AUD_AccumulatorFactory.cpp b/intern/audaspace/FX/AUD_AccumulatorFactory.cpp
new file mode 100644
index 00000000000..62d3fba818e
--- /dev/null
+++ b/intern/audaspace/FX/AUD_AccumulatorFactory.cpp
@@ -0,0 +1,49 @@
+/*
+ * $Id: AUD_AccumulatorFactory.cpp 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_AccumulatorFactory.h"
+#include "AUD_AccumulatorReader.h"
+
+AUD_AccumulatorFactory::AUD_AccumulatorFactory(AUD_IFactory* factory,
+											   bool additive) :
+		AUD_EffectFactory(factory),
+		m_additive(additive) {}
+
+AUD_AccumulatorFactory::AUD_AccumulatorFactory(bool additive) :
+		AUD_EffectFactory(0),
+		m_additive(additive) {}
+
+AUD_IReader* AUD_AccumulatorFactory::createReader()
+{
+	AUD_IReader* reader = getReader();
+
+	if(reader != 0)
+	{
+		reader = new AUD_AccumulatorReader(reader, m_additive);
+		AUD_NEW("reader")
+	}
+
+	return reader;
+}
diff --git a/intern/audaspace/FX/AUD_AccumulatorFactory.h b/intern/audaspace/FX/AUD_AccumulatorFactory.h
new file mode 100644
index 00000000000..ea7b25d6171
--- /dev/null
+++ b/intern/audaspace/FX/AUD_AccumulatorFactory.h
@@ -0,0 +1,59 @@
+/*
+ * $Id: AUD_AccumulatorFactory.h 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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_ACCUMULATORFACTORY
+#define AUD_ACCUMULATORFACTORY
+
+#include "AUD_EffectFactory.h"
+
+/**
+ * This factory creates an accumulator reader.
+ */
+class AUD_AccumulatorFactory : public AUD_EffectFactory
+{
+private:
+	/**
+	 * Whether the accumulator is additive.
+	 */
+	bool m_additive;
+
+public:
+	/**
+	 * Creates a new accumulator factory.
+	 * \param factory The input factory.
+	 * \param additive Whether the accumulator is additive.
+	 */
+	AUD_AccumulatorFactory(AUD_IFactory* factory, bool additive = false);
+
+	/**
+	 * Creates a new accumulator factory.
+	 * \param additive Whether the accumulator is additive.
+	 */
+	AUD_AccumulatorFactory(bool additive = false);
+
+	virtual AUD_IReader* createReader();
+};
+
+#endif //AUD_ACCUMULATORFACTORY
diff --git a/intern/audaspace/FX/AUD_AccumulatorReader.cpp b/intern/audaspace/FX/AUD_AccumulatorReader.cpp
new file mode 100644
index 00000000000..a5aeb72cca5
--- /dev/null
+++ b/intern/audaspace/FX/AUD_AccumulatorReader.cpp
@@ -0,0 +1,99 @@
+/*
+ * $Id: AUD_AccumulatorReader.cpp 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_AccumulatorReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+
+#define CC specs.channels + channel
+
+AUD_AccumulatorReader::AUD_AccumulatorReader(AUD_IReader* reader,
+											 bool additive) :
+		AUD_EffectReader(reader),
+		m_additive(additive)
+{
+	AUD_Specs specs = reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+
+	m_sums = new AUD_Buffer(samplesize); AUD_NEW("buffer")
+	memset(m_sums->getBuffer(), 0, samplesize);
+
+	m_prevs = new AUD_Buffer(samplesize); AUD_NEW("buffer")
+	memset(m_prevs->getBuffer(), 0, samplesize);
+}
+
+AUD_AccumulatorReader::~AUD_AccumulatorReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+	delete m_sums; AUD_DELETE("buffer")
+	delete m_prevs; AUD_DELETE("buffer")
+}
+
+void AUD_AccumulatorReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	sample_t* sums;
+	sample_t* prevs;
+	sums = m_sums->getBuffer();
+	prevs = m_prevs->getBuffer();
+
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+
+	if(m_additive)
+	{
+		for(int channel = 0; channel < specs.channels; channel++)
+		{
+			for(int i = 0; i < length; i++)
+			{
+				if(buf[i * CC] > prevs[channel])
+					sums[channel] += buf[i * CC] - prevs[channel];
+				buffer[i * CC] = sums[channel] + buf[i * CC];
+				prevs[channel] = buf[i * CC];
+			}
+		}
+	}
+	else
+	{
+		for(int channel = 0; channel < specs.channels; channel++)
+		{
+			for(int i = 0; i < length * specs.channels; i++)
+			{
+				if(buf[i * CC] > prevs[channel])
+					sums[channel] += buf[i * CC] - prevs[channel];
+				buffer[i * CC] = sums[channel];
+				prevs[channel] = buf[i * CC];
+			}
+		}
+	}
+}
diff --git a/intern/audaspace/FX/AUD_AccumulatorReader.h b/intern/audaspace/FX/AUD_AccumulatorReader.h
new file mode 100644
index 00000000000..45cc0cf36c9
--- /dev/null
+++ b/intern/audaspace/FX/AUD_AccumulatorReader.h
@@ -0,0 +1,75 @@
+/*
+ * $Id: AUD_AccumulatorReader.h 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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_ACCUMULATORREADER
+#define AUD_ACCUMULATORREADER
+
+#include "AUD_EffectReader.h"
+class AUD_Buffer;
+
+/**
+ * This class represents an accumulator.
+ */
+class AUD_AccumulatorReader : public AUD_EffectReader
+{
+private:
+	/**
+	 * The playback buffer.
+	 */
+	AUD_Buffer *m_buffer;
+
+	/**
+	 * The sums of the specific channels.
+	 */
+	AUD_Buffer *m_sums;
+
+	/**
+	 * The previous results of the specific channels.
+	 */
+	AUD_Buffer *m_prevs;
+
+	/**
+	 * Whether the accumulator is additive.
+	 */
+	bool m_additive;
+
+public:
+	/**
+	 * Creates a new accumulator reader.
+	 * \param reader The reader to read from.
+	 * \param additive Whether the accumulator is additive.
+	 * \exception AUD_Exception Thrown if the reader specified is NULL.
+	 */
+	AUD_AccumulatorReader(AUD_IReader* reader, bool additive);
+
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~AUD_AccumulatorReader();
+
+	virtual void read(int & length, sample_t* & buffer);
+};
+
+#endif //AUD_ACCUMULATORREADER
diff --git a/intern/audaspace/FX/AUD_ButterworthFactory.cpp b/intern/audaspace/FX/AUD_ButterworthFactory.cpp
new file mode 100644
index 00000000000..f75790e4ad2
--- /dev/null
+++ b/intern/audaspace/FX/AUD_ButterworthFactory.cpp
@@ -0,0 +1,49 @@
+/*
+ * $Id: AUD_ButterworthFactory.cpp 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_ButterworthFactory.h"
+#include "AUD_ButterworthReader.h"
+
+AUD_ButterworthFactory::AUD_ButterworthFactory(AUD_IFactory* factory,
+											   float frequency) :
+		AUD_EffectFactory(factory),
+		m_frequency(frequency) {}
+
+AUD_ButterworthFactory::AUD_ButterworthFactory(float frequency) :
+		AUD_EffectFactory(0),
+		m_frequency(frequency) {}
+
+AUD_IReader* AUD_ButterworthFactory::createReader()
+{
+	AUD_IReader* reader = getReader();
+
+	if(reader != 0)
+	{
+		reader = new AUD_ButterworthReader(reader, m_frequency);
+		AUD_NEW("reader")
+	}
+
+	return reader;
+}
diff --git a/intern/audaspace/FX/AUD_ButterworthFactory.h b/intern/audaspace/FX/AUD_ButterworthFactory.h
new file mode 100644
index 00000000000..7854927e76d
--- /dev/null
+++ b/intern/audaspace/FX/AUD_ButterworthFactory.h
@@ -0,0 +1,59 @@
+/*
+ * $Id: AUD_ButterworthFactory.h 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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_BUTTERWORTHFACTORY
+#define AUD_BUTTERWORTHFACTORY
+
+#include "AUD_EffectFactory.h"
+
+/**
+ * This factory creates a butterworth filter reader.
+ */
+class AUD_ButterworthFactory : public AUD_EffectFactory
+{
+private:
+	/**
+	 * The attack value in seconds.
+	 */
+	float m_frequency;
+
+public:
+	/**
+	 * Creates a new butterworth factory.
+	 * \param factory The input factory.
+	 * \param frequency The cutoff frequency.
+	 */
+	AUD_ButterworthFactory(AUD_IFactory* factory, float frequency);
+
+	/**
+	 * Creates a new butterworth factory.
+	 * \param frequency The cutoff frequency.
+	 */
+	AUD_ButterworthFactory(float frequency);
+
+	virtual AUD_IReader* createReader();
+};
+
+#endif //AUD_BUTTERWORTHFACTORY
diff --git a/intern/audaspace/FX/AUD_ButterworthReader.cpp b/intern/audaspace/FX/AUD_ButterworthReader.cpp
new file mode 100644
index 00000000000..1c2d7426a40
--- /dev/null
+++ b/intern/audaspace/FX/AUD_ButterworthReader.cpp
@@ -0,0 +1,124 @@
+/*
+ * $Id: AUD_ButterworthReader.cpp 25645 2010-01-01 11:40:48Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_ButterworthReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+#include <cmath>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+#define BWPB41 0.76536686473
+#define BWPB42 1.84775906502
+#define CC channels + channel
+
+AUD_ButterworthReader::AUD_ButterworthReader(AUD_IReader* reader,
+											 float frequency) :
+		AUD_EffectReader(reader)
+{
+	AUD_Specs specs = reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+
+	m_outvalues = new AUD_Buffer(samplesize * 5); AUD_NEW("buffer")
+	memset(m_outvalues->getBuffer(), 0, samplesize * 5);
+
+	m_invalues = new AUD_Buffer(samplesize * 5); AUD_NEW("buffer")
+	memset(m_invalues->getBuffer(), 0, samplesize * 5);
+
+	m_position = 0;
+
+	// calculate coefficients
+	float omega = 2 * tan(frequency * M_PI / specs.rate);
+	float o2 = omega * omega;
+	float o4 = o2 * o2;
+	float x1 = o2 + 2 * BWPB41 * omega + 4;
+	float x2 = o2 + 2 * BWPB42 * omega + 4;
+	float y1 = o2 - 2 * BWPB41 * omega + 4;
+	float y2 = o2 - 2 * BWPB42 * omega + 4;
+	float o228 = 2 * o2 - 8;
+	float norm = x1 * x2;
+	m_coeff[0][0] = 0;
+	m_coeff[0][1] = (x1 + x2) * o228 / norm;
+	m_coeff[0][2] = (x1 * y2 + x2 * y1 + o228 * o228) / norm;
+	m_coeff[0][3] = (y1 + y2) * o228 / norm;
+	m_coeff[0][4] = y1 * y2 / norm;
+	m_coeff[1][4] = m_coeff[1][0] = o4 / norm;
+	m_coeff[1][3] = m_coeff[1][1] = 4 * o4 / norm;
+	m_coeff[1][2] = 6 * o4 / norm;
+}
+
+AUD_ButterworthReader::~AUD_ButterworthReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+
+	delete m_outvalues; AUD_DELETE("buffer")
+	delete m_invalues; AUD_DELETE("buffer");
+}
+
+void AUD_ButterworthReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	sample_t* outvalues;
+	sample_t* invalues;
+
+	outvalues = m_outvalues->getBuffer();
+	invalues = m_invalues->getBuffer();
+
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+	int channels = specs.channels;
+
+	for(int channel = 0; channel < channels; channel++)
+	{
+		for(int i = 0; i < length; i++)
+		{
+			invalues[m_position * CC] = buf[i * CC];
+			outvalues[m_position * CC] = 0;
+
+			for(int j = 0; j < 4; j++)
+			{
+				outvalues[m_position * CC] += m_coeff[1][j] *
+									invalues[((m_position + j) % 5) * CC] -
+									m_coeff[0][j] *
+									outvalues[((m_position + j) % 5) * CC];
+			}
+
+			buffer[i * CC] = outvalues[m_position * CC];
+
+			m_position = (m_position + 4) % 5;
+		}
+	}
+}
diff --git a/intern/audaspace/FX/AUD_ButterworthReader.h b/intern/audaspace/FX/AUD_ButterworthReader.h
new file mode 100644
index 00000000000..b93b1f355c5
--- /dev/null
+++ b/intern/audaspace/FX/AUD_ButterworthReader.h
@@ -0,0 +1,83 @@
+/*
+ * $Id: AUD_ButterworthReader.h 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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
diff --git a/intern/audaspace/FX/AUD_EnvelopeFactory.cpp b/intern/audaspace/FX/AUD_EnvelopeFactory.cpp
new file mode 100644
index 00000000000..ff9cb9ad757
--- /dev/null
+++ b/intern/audaspace/FX/AUD_EnvelopeFactory.cpp
@@ -0,0 +1,58 @@
+/*
+ * $Id: AUD_EnvelopeFactory.cpp 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_EnvelopeFactory.h"
+#include "AUD_EnvelopeReader.h"
+
+AUD_EnvelopeFactory::AUD_EnvelopeFactory(AUD_IFactory* factory, float attack,
+										 float release, float threshold,
+										 float arthreshold) :
+		AUD_EffectFactory(factory),
+		m_attack(attack),
+		m_release(release),
+		m_threshold(threshold),
+		m_arthreshold(arthreshold) {}
+
+AUD_EnvelopeFactory::AUD_EnvelopeFactory(float attack, float release,
+										 float threshold, float arthreshold) :
+		AUD_EffectFactory(0),
+		m_attack(attack),
+		m_release(release),
+		m_threshold(threshold),
+		m_arthreshold(arthreshold) {}
+
+AUD_IReader* AUD_EnvelopeFactory::createReader()
+{
+	AUD_IReader* reader = getReader();
+
+	if(reader != 0)
+	{
+		reader = new AUD_EnvelopeReader(reader, m_attack, m_release,
+										m_threshold, m_arthreshold);
+		AUD_NEW("reader")
+	}
+
+	return reader;
+}
diff --git a/intern/audaspace/FX/AUD_EnvelopeFactory.h b/intern/audaspace/FX/AUD_EnvelopeFactory.h
new file mode 100644
index 00000000000..948c53b46e4
--- /dev/null
+++ b/intern/audaspace/FX/AUD_EnvelopeFactory.h
@@ -0,0 +1,82 @@
+/*
+ * $Id: AUD_EnvelopeFactory.h 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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_ENVELOPEFACTORY
+#define AUD_ENVELOPEFACTORY
+
+#include "AUD_EffectFactory.h"
+
+/**
+ * This factory creates an envelope follower reader.
+ */
+class AUD_EnvelopeFactory : public AUD_EffectFactory
+{
+private:
+	/**
+	 * The attack value in seconds.
+	 */
+	float m_attack;
+
+	/**
+	 * The release value in seconds.
+	 */
+	float m_release;
+
+	/**
+	 * The threshold value.
+	 */
+	float m_threshold;
+
+	/**
+	 * The attack/release threshold value.
+	 */
+	float m_arthreshold;
+
+public:
+	/**
+	 * Creates a new envelope factory.
+	 * \param factory The input factory.
+	 * \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.
+	 */
+	AUD_EnvelopeFactory(AUD_IFactory* factory, float attack, float release,
+						float threshold, float arthreshold);
+
+	/**
+	 * Creates a new envelope factory.
+	 * \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.
+	 */
+	AUD_EnvelopeFactory(float attack, float release, float threshold,
+						float arthreshold);
+
+	virtual AUD_IReader* createReader();
+};
+
+#endif //AUD_ENVELOPEFACTORY
diff --git a/intern/audaspace/FX/AUD_EnvelopeReader.cpp b/intern/audaspace/FX/AUD_EnvelopeReader.cpp
new file mode 100644
index 00000000000..ea8136cda22
--- /dev/null
+++ b/intern/audaspace/FX/AUD_EnvelopeReader.cpp
@@ -0,0 +1,86 @@
+/*
+ * $Id: AUD_EnvelopeReader.cpp 25646 2010-01-01 11:55:56Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_EnvelopeReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+#include <cmath>
+
+AUD_EnvelopeReader::AUD_EnvelopeReader(AUD_IReader* reader, float attack,
+									   float release, float threshold,
+									   float arthreshold) :
+		AUD_EffectReader(reader),
+		m_threshold(threshold)
+{
+	AUD_Specs specs = reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+
+	m_envelopes = new AUD_Buffer(samplesize);
+	AUD_NEW("buffer")
+	memset(m_envelopes->getBuffer(), 0, samplesize);
+
+	m_bAttack = pow(arthreshold, 1.0f/(specs.rate * attack));
+	m_bRelease = pow(arthreshold, 1.0f/(specs.rate * release));
+}
+
+AUD_EnvelopeReader::~AUD_EnvelopeReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+	delete m_envelopes; AUD_DELETE("buffer")
+}
+
+void AUD_EnvelopeReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	sample_t* envelopes;
+	envelopes = m_envelopes->getBuffer();
+
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+
+	sample_t value;
+
+	for(int channel = 0; channel < specs.channels; channel++)
+	{
+		for(int i = 0; i < length; i++)
+		{
+			value = fabs(buf[i * specs.channels + channel]);
+			if(value < m_threshold)
+				value = 0.0f;
+
+			buffer[i * specs.channels + channel] = envelopes[channel] =
+				((value > envelopes[channel]) ? m_bAttack : m_bRelease) *
+				 (envelopes[channel] - value) + value;
+		}
+	}
+}
diff --git a/intern/audaspace/FX/AUD_EnvelopeReader.h b/intern/audaspace/FX/AUD_EnvelopeReader.h
new file mode 100644
index 00000000000..5bdc16734a9
--- /dev/null
+++ b/intern/audaspace/FX/AUD_EnvelopeReader.h
@@ -0,0 +1,84 @@
+/*
+ * $Id: AUD_EnvelopeReader.h 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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_ENVELOPEREADER
+#define AUD_ENVELOPEREADER
+
+#include "AUD_EffectReader.h"
+class AUD_Buffer;
+
+/**
+ * This class represents an envelope follower.
+ */
+class AUD_EnvelopeReader : public AUD_EffectReader
+{
+private:
+	/**
+	 * The playback buffer.
+	 */
+	AUD_Buffer *m_buffer;
+
+	/**
+	 * The last envelopes buffer.
+	 */
+	AUD_Buffer *m_envelopes;
+
+	/**
+	 * Attack b value.
+	 */
+	float m_bAttack;
+
+	/**
+	 * Release b value.
+	 */
+	float m_bRelease;
+
+	/**
+	 * Threshold value.
+	 */
+	float m_threshold;
+
+public:
+	/**
+	 * Creates a new envelope 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_EnvelopeReader(AUD_IReader* reader, float attack, float release,
+					   float threshold, float arthreshold);
+
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~AUD_EnvelopeReader();
+
+	virtual void read(int & length, sample_t* & buffer);
+};
+
+#endif //AUD_ENVELOPEREADER
diff --git a/intern/audaspace/FX/AUD_HighpassFactory.cpp b/intern/audaspace/FX/AUD_HighpassFactory.cpp
new file mode 100644
index 00000000000..7b5eb96d28f
--- /dev/null
+++ b/intern/audaspace/FX/AUD_HighpassFactory.cpp
@@ -0,0 +1,51 @@
+/*
+ * $Id: AUD_HighpassFactory.cpp 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_HighpassFactory.h"
+#include "AUD_HighpassReader.h"
+
+AUD_HighpassFactory::AUD_HighpassFactory(AUD_IFactory* factory, float frequency,
+										 float Q) :
+		AUD_EffectFactory(factory),
+		m_frequency(frequency),
+		m_Q(Q) {}
+
+AUD_HighpassFactory::AUD_HighpassFactory(float frequency, float Q) :
+		AUD_EffectFactory(0),
+		m_frequency(frequency),
+		m_Q(Q) {}
+
+AUD_IReader* AUD_HighpassFactory::createReader()
+{
+	AUD_IReader* reader = getReader();
+
+	if(reader != 0)
+	{
+		reader = new AUD_HighpassReader(reader, m_frequency, m_Q);
+		AUD_NEW("reader")
+	}
+
+	return reader;
+}
diff --git a/intern/audaspace/FX/AUD_HighpassFactory.h b/intern/audaspace/FX/AUD_HighpassFactory.h
new file mode 100644
index 00000000000..59cf921b0fe
--- /dev/null
+++ b/intern/audaspace/FX/AUD_HighpassFactory.h
@@ -0,0 +1,66 @@
+/*
+ * $Id: AUD_HighpassFactory.h 25646 2010-01-01 11:55:56Z nexyon $
+ *
+ * ***** 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_HIGHPASSFACTORY
+#define AUD_HIGHPASSFACTORY
+
+#include "AUD_EffectFactory.h"
+
+/**
+ * This factory creates a highpass filter reader.
+ */
+class AUD_HighpassFactory : public AUD_EffectFactory
+{
+private:
+	/**
+	 * The attack value in seconds.
+	 */
+	float m_frequency;
+
+	/**
+	 * The Q factor.
+	 */
+	float m_Q;
+
+public:
+	/**
+	 * Creates a new highpass factory.
+	 * \param factory The input factory.
+	 * \param frequency The cutoff frequency.
+	 * \param Q The Q factor.
+	 */
+	AUD_HighpassFactory(AUD_IFactory* factory, float frequency, float Q = 1.0f);
+
+	/**
+	 * Creates a new highpass factory.
+	 * \param frequency The cutoff frequency.
+	 * \param Q The Q factor.
+	 */
+	AUD_HighpassFactory(float frequency, float Q = 1.0f);
+
+	virtual AUD_IReader* createReader();
+};
+
+#endif //AUD_HIGHPASSFACTORY
diff --git a/intern/audaspace/FX/AUD_HighpassReader.cpp b/intern/audaspace/FX/AUD_HighpassReader.cpp
new file mode 100644
index 00000000000..24bda0f1aa1
--- /dev/null
+++ b/intern/audaspace/FX/AUD_HighpassReader.cpp
@@ -0,0 +1,116 @@
+/*
+ * $Id: AUD_HighpassReader.cpp 25646 2010-01-01 11:55:56Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_HighpassReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+#include <cmath>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+#define CC channels + channel
+
+AUD_HighpassReader::AUD_HighpassReader(AUD_IReader* reader, float frequency,
+									   float Q) :
+		AUD_EffectReader(reader)
+{
+	AUD_Specs specs = reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+
+	m_outvalues = new AUD_Buffer(samplesize * AUD_HIGHPASS_ORDER);
+	AUD_NEW("buffer")
+	memset(m_outvalues->getBuffer(), 0, samplesize * AUD_HIGHPASS_ORDER);
+
+	m_invalues = new AUD_Buffer(samplesize * AUD_HIGHPASS_ORDER);
+	AUD_NEW("buffer")
+	memset(m_invalues->getBuffer(), 0, samplesize * AUD_HIGHPASS_ORDER);
+
+	m_position = 0;
+
+	// calculate coefficients
+	float w0 = 2 * M_PI * frequency / specs.rate;
+	float alpha = sin(w0) / (2 * Q);
+	float norm = 1 + alpha;
+	m_coeff[0][0] = 0;
+	m_coeff[0][1] = -2 * cos(w0) / norm;
+	m_coeff[0][2] = (1 - alpha) / norm;
+	m_coeff[1][2] = m_coeff[1][0] = (1 + cos(w0)) / (2 * norm);
+	m_coeff[1][1] = (-1 - cos(w0)) / norm;
+}
+
+AUD_HighpassReader::~AUD_HighpassReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+
+	delete m_outvalues; AUD_DELETE("buffer")
+	delete m_invalues; AUD_DELETE("buffer");
+}
+
+void AUD_HighpassReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	sample_t* outvalues;
+	sample_t* invalues;
+
+	outvalues = m_outvalues->getBuffer();
+	invalues = m_invalues->getBuffer();
+
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+	int channels = specs.channels;
+
+	for(int channel = 0; channel < channels; channel++)
+	{
+		for(int i = 0; i < length; i++)
+		{
+			invalues[m_position * CC] = buf[i * CC];
+			outvalues[m_position * CC] = 0;
+
+			for(int j = 0; j < AUD_HIGHPASS_ORDER; j++)
+			{
+				outvalues[m_position * CC] += m_coeff[1][j] *
+						invalues[((m_position + j) % AUD_HIGHPASS_ORDER) * CC] -
+						m_coeff[0][j] *
+						outvalues[((m_position + j) % AUD_HIGHPASS_ORDER) * CC];
+			}
+
+			buffer[i * CC] = outvalues[m_position * CC];
+
+			m_position = (m_position + AUD_HIGHPASS_ORDER-1) %
+						 AUD_HIGHPASS_ORDER;
+		}
+	}
+}
diff --git a/intern/audaspace/FX/AUD_HighpassReader.h b/intern/audaspace/FX/AUD_HighpassReader.h
new file mode 100644
index 00000000000..7080de9f8c7
--- /dev/null
+++ b/intern/audaspace/FX/AUD_HighpassReader.h
@@ -0,0 +1,83 @@
+/*
+ * $Id: AUD_HighpassReader.h 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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_HIGHPASSREADER
+#define AUD_HIGHPASSREADER
+
+#include "AUD_EffectReader.h"
+class AUD_Buffer;
+
+#define AUD_HIGHPASS_ORDER 3
+
+/**
+ * This class represents a highpass filter.
+ */
+class AUD_HighpassReader : 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][AUD_HIGHPASS_ORDER];
+
+public:
+	/**
+	 * Creates a new highpass reader.
+	 * \param reader The reader to read from.
+	 * \param frequency The cutoff frequency.
+	 * \param Q The Q factor.
+	 * \exception AUD_Exception Thrown if the reader specified is NULL.
+	 */
+	AUD_HighpassReader(AUD_IReader* reader, float frequency, float Q);
+
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~AUD_HighpassReader();
+
+	virtual void read(int & length, sample_t* & buffer);
+};
+
+#endif //AUD_HIGHPASSREADER
diff --git a/intern/audaspace/FX/AUD_LowpassFactory.cpp b/intern/audaspace/FX/AUD_LowpassFactory.cpp
new file mode 100644
index 00000000000..b8cfd493814
--- /dev/null
+++ b/intern/audaspace/FX/AUD_LowpassFactory.cpp
@@ -0,0 +1,51 @@
+/*
+ * $Id: AUD_LowpassFactory.cpp 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_LowpassFactory.h"
+#include "AUD_LowpassReader.h"
+
+AUD_LowpassFactory::AUD_LowpassFactory(AUD_IFactory* factory, float frequency,
+									   float Q) :
+		AUD_EffectFactory(factory),
+		m_frequency(frequency),
+		m_Q(Q) {}
+
+AUD_LowpassFactory::AUD_LowpassFactory(float frequency, float Q) :
+		AUD_EffectFactory(0),
+		m_frequency(frequency),
+		m_Q(Q) {}
+
+AUD_IReader* AUD_LowpassFactory::createReader()
+{
+	AUD_IReader* reader = getReader();
+
+	if(reader != 0)
+	{
+		reader = new AUD_LowpassReader(reader, m_frequency, m_Q);
+		AUD_NEW("reader")
+	}
+
+	return reader;
+}
diff --git a/intern/audaspace/FX/AUD_LowpassFactory.h b/intern/audaspace/FX/AUD_LowpassFactory.h
new file mode 100644
index 00000000000..5dce13837dc
--- /dev/null
+++ b/intern/audaspace/FX/AUD_LowpassFactory.h
@@ -0,0 +1,66 @@
+/*
+ * $Id: AUD_LowpassFactory.h 25646 2010-01-01 11:55:56Z nexyon $
+ *
+ * ***** 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_LOWPASSFACTORY
+#define AUD_LOWPASSFACTORY
+
+#include "AUD_EffectFactory.h"
+
+/**
+ * This factory creates a lowpass filter reader.
+ */
+class AUD_LowpassFactory : public AUD_EffectFactory
+{
+private:
+	/**
+	 * The attack value in seconds.
+	 */
+	float m_frequency;
+
+	/**
+	 * The Q factor.
+	 */
+	float m_Q;
+
+public:
+	/**
+	 * Creates a new lowpass factory.
+	 * \param factory The input factory.
+	 * \param frequency The cutoff frequency.
+	 * \param Q The Q factor.
+	 */
+	AUD_LowpassFactory(AUD_IFactory* factory, float frequency, float Q = 1.0f);
+
+	/**
+	 * Creates a new lowpass factory.
+	 * \param frequency The cutoff frequency.
+	 * \param Q The Q factor.
+	 */
+	AUD_LowpassFactory(float frequency, float Q = 1.0f);
+
+	virtual AUD_IReader* createReader();
+};
+
+#endif //AUD_LOWPASSFACTORY
diff --git a/intern/audaspace/FX/AUD_LowpassReader.cpp b/intern/audaspace/FX/AUD_LowpassReader.cpp
new file mode 100644
index 00000000000..135db4372af
--- /dev/null
+++ b/intern/audaspace/FX/AUD_LowpassReader.cpp
@@ -0,0 +1,115 @@
+/*
+ * $Id: AUD_LowpassReader.cpp 25646 2010-01-01 11:55:56Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_LowpassReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+#include <cmath>
+
+#ifndef M_PI
+#define M_PI 3.14159265358979323846
+#endif
+
+#define CC channels + channel
+
+AUD_LowpassReader::AUD_LowpassReader(AUD_IReader* reader, float frequency,
+									 float Q) :
+		AUD_EffectReader(reader)
+{
+	AUD_Specs specs = reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+
+	m_outvalues = new AUD_Buffer(samplesize * AUD_LOWPASS_ORDER);
+	AUD_NEW("buffer")
+	memset(m_outvalues->getBuffer(), 0, samplesize * AUD_LOWPASS_ORDER);
+
+	m_invalues = new AUD_Buffer(samplesize * AUD_LOWPASS_ORDER);
+	AUD_NEW("buffer")
+	memset(m_invalues->getBuffer(), 0, samplesize * AUD_LOWPASS_ORDER);
+
+	m_position = 0;
+
+	// calculate coefficients
+	float w0 = 2 * M_PI * frequency / specs.rate;
+	float alpha = sin(w0) / (2 * Q);
+	float norm = 1 + alpha;
+	m_coeff[0][0] = 0;
+	m_coeff[0][1] = -2 * cos(w0) / norm;
+	m_coeff[0][2] = (1 - alpha) / norm;
+	m_coeff[1][2] = m_coeff[1][0] = (1 - cos(w0)) / (2 * norm);
+	m_coeff[1][1] = (1 - cos(w0)) / norm;
+}
+
+AUD_LowpassReader::~AUD_LowpassReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+
+	delete m_outvalues; AUD_DELETE("buffer")
+	delete m_invalues; AUD_DELETE("buffer");
+}
+
+void AUD_LowpassReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	sample_t* outvalues;
+	sample_t* invalues;
+
+	outvalues = m_outvalues->getBuffer();
+	invalues = m_invalues->getBuffer();
+
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+	int channels = specs.channels;
+
+	for(int channel = 0; channel < channels; channel++)
+	{
+		for(int i = 0; i < length; i++)
+		{
+			invalues[m_position * CC] = buf[i * CC];
+			outvalues[m_position * CC] = 0;
+
+			for(int j = 0; j < AUD_LOWPASS_ORDER; j++)
+			{
+				outvalues[m_position * CC] += m_coeff[1][j] *
+						invalues[((m_position + j) % AUD_LOWPASS_ORDER) * CC] -
+						m_coeff[0][j] *
+						outvalues[((m_position + j) % AUD_LOWPASS_ORDER) * CC];
+			}
+
+			buffer[i * CC] = outvalues[m_position * CC];
+
+			m_position = (m_position + AUD_LOWPASS_ORDER-1) % AUD_LOWPASS_ORDER;
+		}
+	}
+}
diff --git a/intern/audaspace/FX/AUD_LowpassReader.h b/intern/audaspace/FX/AUD_LowpassReader.h
new file mode 100644
index 00000000000..a76e1de5e76
--- /dev/null
+++ b/intern/audaspace/FX/AUD_LowpassReader.h
@@ -0,0 +1,83 @@
+/*
+ * $Id: AUD_LowpassReader.h 25643 2010-01-01 05:09:30Z nexyon $
+ *
+ * ***** 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_LOWPASSREADER
+#define AUD_LOWPASSREADER
+
+#include "AUD_EffectReader.h"
+class AUD_Buffer;
+
+#define AUD_LOWPASS_ORDER 3
+
+/**
+ * This class represents a lowpass filter.
+ */
+class AUD_LowpassReader : 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][AUD_LOWPASS_ORDER];
+
+public:
+	/**
+	 * Creates a new lowpass reader.
+	 * \param reader The reader to read from.
+	 * \param frequency The cutoff frequency.
+	 * \param Q The Q factor.
+	 * \exception AUD_Exception Thrown if the reader specified is NULL.
+	 */
+	AUD_LowpassReader(AUD_IReader* reader, float frequency, float Q);
+
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~AUD_LowpassReader();
+
+	virtual void read(int & length, sample_t* & buffer);
+};
+
+#endif //AUD_LOWPASSREADER
diff --git a/intern/audaspace/FX/AUD_SquareFactory.cpp b/intern/audaspace/FX/AUD_SquareFactory.cpp
new file mode 100644
index 00000000000..d16bc84780b
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SquareFactory.cpp
@@ -0,0 +1,57 @@
+/*
+ * $Id: AUD_SquareFactory.cpp 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_SquareFactory.h"
+#include "AUD_SquareReader.h"
+
+AUD_SquareFactory::AUD_SquareFactory(AUD_IFactory* factory, float threshold) :
+		AUD_EffectFactory(factory),
+		m_threshold(threshold) {}
+
+AUD_SquareFactory::AUD_SquareFactory(float threshold) :
+		AUD_EffectFactory(0),
+		m_threshold(threshold) {}
+
+float AUD_SquareFactory::getThreshold()
+{
+	return m_threshold;
+}
+
+void AUD_SquareFactory::setThreshold(float threshold)
+{
+	m_threshold = threshold;
+}
+
+AUD_IReader* AUD_SquareFactory::createReader()
+{
+	AUD_IReader* reader = getReader();
+
+	if(reader != 0)
+	{
+		reader = new AUD_SquareReader(reader, m_threshold); AUD_NEW("reader")
+	}
+
+	return reader;
+}
diff --git a/intern/audaspace/FX/AUD_SquareFactory.h b/intern/audaspace/FX/AUD_SquareFactory.h
new file mode 100644
index 00000000000..2c0562ade8e
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SquareFactory.h
@@ -0,0 +1,70 @@
+/*
+ * $Id: AUD_SquareFactory.h 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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_SQUAREFACTORY
+#define AUD_SQUAREFACTORY
+
+#include "AUD_EffectFactory.h"
+
+/**
+ * This factory Transforms any signal to a square signal.
+ */
+class AUD_SquareFactory : public AUD_EffectFactory
+{
+private:
+	/**
+	 * The threshold.
+	 */
+	float m_threshold;
+
+public:
+	/**
+	 * Creates a new square factory.
+	 * \param factory The input factory.
+	 * \param threshold The threshold.
+	 */
+	AUD_SquareFactory(AUD_IFactory* factory = 0, float threshold = 0.0f);
+
+	/**
+	 * Creates a new square factory.
+	 * \param threshold The threshold.
+	 */
+	AUD_SquareFactory(float threshold);
+
+	/**
+	 * Returns the threshold.
+	 */
+	float getThreshold();
+
+	/**
+	 * Sets the threshold.
+	 * \param threshold The new threshold value. Should be between 0.0 and 1.0.
+	 */
+	void setThreshold(float threshold);
+
+	virtual AUD_IReader* createReader();
+};
+
+#endif //AUD_SQUAREFACTORY
diff --git a/intern/audaspace/FX/AUD_SquareReader.cpp b/intern/audaspace/FX/AUD_SquareReader.cpp
new file mode 100644
index 00000000000..c6bfc749f14
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SquareReader.cpp
@@ -0,0 +1,63 @@
+/*
+ * $Id: AUD_SquareReader.cpp 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_SquareReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+
+AUD_SquareReader::AUD_SquareReader(AUD_IReader* reader, float threshold) :
+		AUD_EffectReader(reader),
+		m_threshold(threshold)
+{
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+}
+
+AUD_SquareReader::~AUD_SquareReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+}
+
+void AUD_SquareReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+
+	for(int i = 0; i < length * specs.channels; i++)
+	{
+		if(buf[i] >= m_threshold)
+			buffer[i] = 1.0f;
+		else if(buf[i] <= -m_threshold)
+			buffer[i] = -1.0f;
+		else
+			buffer[i] = 0.0f;
+	}
+}
diff --git a/intern/audaspace/FX/AUD_SquareReader.h b/intern/audaspace/FX/AUD_SquareReader.h
new file mode 100644
index 00000000000..d3d99317a09
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SquareReader.h
@@ -0,0 +1,65 @@
+/*
+ * $Id: AUD_SquareReader.h 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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_SQUAREREADER
+#define AUD_SQUAREREADER
+
+#include "AUD_EffectReader.h"
+class AUD_Buffer;
+
+/**
+ * This class changes another signal into a square signal.
+ */
+class AUD_SquareReader : public AUD_EffectReader
+{
+private:
+	/**
+	 * The playback buffer.
+	 */
+	AUD_Buffer *m_buffer;
+
+	/**
+	 * The threshold level.
+	 */
+	float m_threshold;
+
+public:
+	/**
+	 * Creates a new square reader.
+	 * \param reader The reader to read from.
+	 * \param threshold The size of the buffer.
+	 * \exception AUD_Exception Thrown if the reader specified is NULL.
+	 */
+	AUD_SquareReader(AUD_IReader* reader, float threshold);
+
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~AUD_SquareReader();
+
+	virtual void read(int & length, sample_t* & buffer);
+};
+
+#endif //AUD_SQUAREREADER
diff --git a/intern/audaspace/FX/AUD_SumFactory.cpp b/intern/audaspace/FX/AUD_SumFactory.cpp
new file mode 100644
index 00000000000..e00a2e78b7b
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SumFactory.cpp
@@ -0,0 +1,43 @@
+/*
+ * $Id: AUD_SumFactory.cpp 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_SumFactory.h"
+#include "AUD_SumReader.h"
+
+AUD_SumFactory::AUD_SumFactory(AUD_IFactory* factory) :
+		AUD_EffectFactory(factory) {}
+
+AUD_IReader* AUD_SumFactory::createReader()
+{
+	AUD_IReader* reader = getReader();
+
+	if(reader != 0)
+	{
+		reader = new AUD_SumReader(reader);
+		AUD_NEW("reader")
+	}
+
+	return reader;
+}
diff --git a/intern/audaspace/FX/AUD_SumFactory.h b/intern/audaspace/FX/AUD_SumFactory.h
new file mode 100644
index 00000000000..d5bb2fa8270
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SumFactory.h
@@ -0,0 +1,46 @@
+/*
+ * $Id: AUD_SumFactory.h 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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_SUMFACTORY
+#define AUD_SUMFACTORY
+
+#include "AUD_EffectFactory.h"
+
+/**
+ * This factory creates a sum reader.
+ */
+class AUD_SumFactory : public AUD_EffectFactory
+{
+public:
+	/**
+	 * Creates a new sum factory.
+	 * \param factory The input factory.
+	 */
+	AUD_SumFactory(AUD_IFactory* factory = 0);
+
+	virtual AUD_IReader* createReader();
+};
+
+#endif //AUD_SUMFACTORY
diff --git a/intern/audaspace/FX/AUD_SumReader.cpp b/intern/audaspace/FX/AUD_SumReader.cpp
new file mode 100644
index 00000000000..5147661bf24
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SumReader.cpp
@@ -0,0 +1,68 @@
+/*
+ * $Id: AUD_SumReader.cpp 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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 *****
+ */
+
+#include "AUD_SumReader.h"
+#include "AUD_Buffer.h"
+
+#include <cstring>
+
+#define CC specs.channels + channel
+
+AUD_SumReader::AUD_SumReader(AUD_IReader* reader) :
+		AUD_EffectReader(reader)
+{
+	AUD_Specs specs = reader->getSpecs();
+	int samplesize = AUD_SAMPLE_SIZE(specs);
+
+	m_buffer = new AUD_Buffer(); AUD_NEW("buffer")
+
+	m_sums = new AUD_Buffer(samplesize); AUD_NEW("buffer")
+	memset(m_sums->getBuffer(), 0, samplesize);
+}
+
+AUD_SumReader::~AUD_SumReader()
+{
+	delete m_buffer; AUD_DELETE("buffer")
+	delete m_sums; AUD_DELETE("buffer")
+}
+
+void AUD_SumReader::read(int & length, sample_t* & buffer)
+{
+	sample_t* buf;
+	sample_t* sums;
+	sums = m_sums->getBuffer();
+
+	AUD_Specs specs = m_reader->getSpecs();
+
+	m_reader->read(length, buf);
+	if(m_buffer->getSize() < length * AUD_SAMPLE_SIZE(specs))
+		m_buffer->resize(length * AUD_SAMPLE_SIZE(specs));
+
+	buffer = m_buffer->getBuffer();
+
+	for(int channel = 0; channel < specs.channels; channel++)
+		for(int i = 0; i < length * specs.channels; i++)
+			buffer[i * CC] = sums[channel] = sums[channel] + buf[i * CC];
+}
diff --git a/intern/audaspace/FX/AUD_SumReader.h b/intern/audaspace/FX/AUD_SumReader.h
new file mode 100644
index 00000000000..fb59a39faa8
--- /dev/null
+++ b/intern/audaspace/FX/AUD_SumReader.h
@@ -0,0 +1,64 @@
+/*
+ * $Id: AUD_SumReader.h 25656 2010-01-01 18:45:21Z nexyon $
+ *
+ * ***** 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_SUMREADER
+#define AUD_SUMREADER
+
+#include "AUD_EffectReader.h"
+class AUD_Buffer;
+
+/**
+ * This class represents an summer.
+ */
+class AUD_SumReader : public AUD_EffectReader
+{
+private:
+	/**
+	 * The playback buffer.
+	 */
+	AUD_Buffer *m_buffer;
+
+	/**
+	 * The sums of the specific channels.
+	 */
+	AUD_Buffer *m_sums;
+
+public:
+	/**
+	 * Creates a new sum reader.
+	 * \param reader The reader to read from.
+	 * \exception AUD_Exception Thrown if the reader specified is NULL.
+	 */
+	AUD_SumReader(AUD_IReader* reader);
+
+	/**
+	 * Destroys the reader.
+	 */
+	virtual ~AUD_SumReader();
+
+	virtual void read(int & length, sample_t* & buffer);
+};
+
+#endif //AUD_SUMREADER