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diff --git a/extern/audaspace/include/fx/MutableReader.h b/extern/audaspace/include/fx/MutableReader.h
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+/*******************************************************************************
+* Copyright 2015-2016 Juan Francisco Crespo Galán
+*
+* 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 MutableReader.h
+* @ingroup fx
+* The MutableReader class.
+*/
+
+#include "IReader.h"
+#include "ISound.h"
+
+#include <memory>
+
+AUD_NAMESPACE_BEGIN
+
+/**
+* This class represents a reader for a sound that can change with each playback. The change will occur when trying to seek backwards
+* If the sound doesn't support that, it will be restarted.
+* \warning Notice that if a SoundList object is assigned to several MutableReaders, sequential playback won't work correctly.
+*          To prevent this the SoundList must be copied.
+*/
+class AUD_API MutableReader : public IReader
+{
+private:
+	/**
+	* The current reader.
+	*/
+	std::shared_ptr<IReader> m_reader;
+
+	/**
+	* A sound from which to get the reader.
+	*/
+	std::shared_ptr<ISound> m_sound;
+
+
+	// delete copy constructor and operator=
+	MutableReader(const MutableReader&) = delete;
+	MutableReader& operator=(const MutableReader&) = delete;
+
+public:
+	/**
+	* Creates a new mutable reader.
+	* \param sound A of sound you want to assign to this reader.
+	*/
+	MutableReader(std::shared_ptr<ISound> sound);
+
+	virtual bool isSeekable() const;
+	virtual void seek(int position);
+	virtual int getLength() const;
+	virtual int getPosition() const;
+	virtual Specs getSpecs() const;
+	virtual void read(int& length, bool& eos, sample_t* buffer);
+};
+
+AUD_NAMESPACE_END