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diff --git a/extern/audaspace/include/fx/ADSRReader.h b/extern/audaspace/include/fx/ADSRReader.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 ADSRReader.h
+ * @ingroup fx
+ * The ADSRReader class.
+ */
+
+#include "fx/EffectReader.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This class is an ADSR filters.
+ */
+class AUD_API ADSRReader : public EffectReader
+{
+private:
+	enum ADSRState
+	{
+		ADSR_STATE_INVALID = 0,		/// Invalid ADSR state or finished.
+		ADSR_STATE_ATTACK  = 1,		/// Initial attack state.
+		ADSR_STATE_DECAY   = 2,		/// Decay state.
+		ADSR_STATE_SUSTAIN = 3,		/// Sustain state.
+		ADSR_STATE_RELEASE = 4		/// Release state.
+	};
+
+	/**
+	 * Attack time.
+	 */
+	float m_attack;
+
+	/**
+	 * Decay time.
+	 */
+	float m_decay;
+
+	/**
+	 * Sustain level.
+	 */
+	float m_sustain;
+
+	/**
+	 * Release time.
+	 */
+	float m_release;
+
+	/**
+	 * Current state.
+	 */
+	ADSRState m_state;
+
+	/**
+	 * Current level.
+	 */
+	float m_level;
+
+	// delete copy constructor and operator=
+	ADSRReader(const ADSRReader&) = delete;
+	ADSRReader& operator=(const ADSRReader&) = delete;
+
+	void AUD_LOCAL nextState(ADSRState state);
+
+public:
+	/**
+	 * Creates a new ADSR reader.
+	 * \param reader The reader to read from.
+	 * \param attack The attack time in seconds.
+	 * \param decay The decay time in seconds.
+	 * \param sustain The sustain level, should be in range [0 - 1].
+	 * \param release The release time in seconds.
+	 */
+	ADSRReader(std::shared_ptr<IReader> reader, float attack, float decay, float sustain, float release);
+
+	virtual ~ADSRReader();
+
+	virtual void read(int& length, bool& eos, sample_t* buffer);
+
+	/**
+	 * Triggers the release.
+	 */
+	void release();
+};
+
+AUD_NAMESPACE_END