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diff --git a/extern/audaspace/include/respec/Mixer.h b/extern/audaspace/include/respec/Mixer.h
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+/*******************************************************************************
+ * Copyright 2009-2016 Jörg Müller
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ ******************************************************************************/
+
+#pragma once
+
+/**
+ * @file Mixer.h
+ * @ingroup respec
+ * The Mixer class.
+ */
+
+#include "respec/Specification.h"
+#include "respec/ConverterFunctions.h"
+#include "util/Buffer.h"
+
+#include <memory>
+
+AUD_NAMESPACE_BEGIN
+
+class IReader;
+
+/**
+ * This abstract class is able to mix audiosignals with same channel count
+ * and sample rate and convert it to a specific output format.
+ */
+class AUD_API Mixer
+{
+private:
+	// delete copy constructor and operator=
+	Mixer(const Mixer&) = delete;
+	Mixer& operator=(const Mixer&) = delete;
+
+protected:
+	/**
+	 * The output specification.
+	 */
+	DeviceSpecs m_specs;
+
+	/**
+	 * The length of the mixing buffer.
+	 */
+	int m_length;
+
+	/**
+	 * The mixing buffer.
+	 */
+	Buffer m_buffer;
+
+	/**
+	 * Converter function.
+	 */
+	convert_f m_convert;
+
+public:
+	/**
+	 * Creates the mixer.
+	 */
+	Mixer(DeviceSpecs specs);
+
+	/**
+	 * Destroys the mixer.
+	 */
+	virtual ~Mixer() {}
+
+	/**
+	 * Returns the target specification for superposing.
+	 * \return The target specification.
+	 */
+	DeviceSpecs getSpecs() const;
+
+	/**
+	 * Sets the target specification for superposing.
+	 * \param specs The target specification.
+	 */
+	void setSpecs(Specs specs);
+
+	/**
+	 * Mixes a buffer.
+	 * \param buffer The buffer to superpose.
+	 * \param start The start sample of the buffer.
+	 * \param length The length of the buffer in samples.
+	 * \param volume The mixing volume. Must be a value between 0.0 and 1.0.
+	 */
+	void mix(sample_t* buffer, int start, int length, float volume);
+
+	/**
+	 * Mixes a buffer with linear volume interpolation.
+	 * \param buffer The buffer to superpose.
+	 * \param start The start sample of the buffer.
+	 * \param length The length of the buffer in samples.
+	 * \param volume_to The target mixing volume. Must be a value between 0.0 and 1.0.
+	 * \param volume_from The start mixing volume. Must be a value between 0.0 and 1.0.
+	 */
+	void mix(sample_t* buffer, int start, int length, float volume_to, float volume_from);
+
+	/**
+	 * Writes the mixing buffer into an output buffer.
+	 * \param buffer The target buffer for superposing.
+	 * \param volume The mixing volume. Must be a value between 0.0 and 1.0.
+	 */
+	void read(data_t* buffer, float volume);
+
+	/**
+	 * Clears the mixing buffer.
+	 * \param length The length of the buffer in samples.
+	 */
+	void clear(int length);
+};
+
+AUD_NAMESPACE_END