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diff --git a/extern/audaspace/include/sequence/PingPong.h b/extern/audaspace/include/sequence/PingPong.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 PingPong.h
+ * @ingroup sequence
+ * The PingPong class.
+ */
+
+#include "fx/Effect.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This sound plays another sound first normal, then reversed.
+ * \note Readers from the underlying sound must be reversable with seeking.
+ */
+class AUD_API PingPong : public Effect
+{
+private:
+	// delete copy constructor and operator=
+	PingPong(const PingPong&) = delete;
+	PingPong& operator=(const PingPong&) = delete;
+
+public:
+	/**
+	 * Creates a new ping pong sound.
+	 * \param sound The input sound.
+	 */
+	PingPong(std::shared_ptr<ISound> sound);
+
+	virtual std::shared_ptr<IReader> createReader();
+};
+
+AUD_NAMESPACE_END