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diff --git a/extern/audaspace/include/fx/Envelope.h b/extern/audaspace/include/fx/Envelope.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 Envelope.h
+ * @ingroup fx
+ * The Envelope class.
+ */
+
+#include "fx/Effect.h"
+
+AUD_NAMESPACE_BEGIN
+
+class CallbackIIRFilterReader;
+struct EnvelopeParameters;
+
+/**
+ * This sound creates an envelope follower reader.
+ */
+class AUD_API Envelope : public Effect
+{
+private:
+	/**
+	 * The attack value in seconds.
+	 */
+	const float m_attack;
+
+	/**
+	 * The release value in seconds.
+	 */
+	const float m_release;
+
+	/**
+	 * The threshold value.
+	 */
+	const float m_threshold;
+
+	/**
+	 * The attack/release threshold value.
+	 */
+	const float m_arthreshold;
+
+	// delete copy constructor and operator=
+	Envelope(const Envelope&) = delete;
+	Envelope& operator=(const Envelope&) = delete;
+
+public:
+	/**
+	 * Creates a new envelope sound.
+	 * \param sound The input sound.
+	 * \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.
+	 */
+	Envelope(std::shared_ptr<ISound> sound, float attack, float release,
+						float threshold, float arthreshold);
+
+	virtual std::shared_ptr<IReader> createReader();
+
+	/**
+	 * The envelopeFilter function implements the doFilterIIR callback
+	 * for the callback IIR filter.
+	 * @param reader The CallbackIIRFilterReader that executes the callback.
+	 * @param param The envelope parameters.
+	 * @return The filtered sample.
+	 */
+	static sample_t AUD_LOCAL envelopeFilter(CallbackIIRFilterReader* reader, EnvelopeParameters* param);
+
+	/**
+	 * The endEnvelopeFilter function implements the endFilterIIR callback
+	 * for the callback IIR filter.
+	 * @param param The envelope parameters.
+	 */
+	static void AUD_LOCAL endEnvelopeFilter(EnvelopeParameters* param);
+};
+
+AUD_NAMESPACE_END