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diff --git a/extern/audaspace/include/fx/Accumulator.h b/extern/audaspace/include/fx/Accumulator.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 Accumulator.h
+ * @ingroup fx
+ * The Accumulator class.
+ */
+
+#include "fx/Effect.h"
+
+AUD_NAMESPACE_BEGIN
+
+class CallbackIIRFilterReader;
+
+/**
+ * This sound creates an accumulator reader.
+ *
+ * The accumulator adds the difference at the input to the last output in case
+ * it's positive. In additive mode it additionaly adds the difference always.
+ * So in case the difference is positive, it's added twice.
+ */
+class AUD_API Accumulator : public Effect
+{
+private:
+	/**
+	 * Whether the accumulator is additive.
+	 */
+	const bool m_additive;
+
+	// delete copy constructor and operator=
+	Accumulator(const Accumulator&) = delete;
+	Accumulator& operator=(const Accumulator&) = delete;
+
+public:
+	/**
+	 * Creates a new accumulator sound.
+	 * \param sound The input sound.
+	 * \param additive Whether the accumulator is additive.
+	 */
+	Accumulator(std::shared_ptr<ISound> sound, bool additive = false);
+
+	virtual std::shared_ptr<IReader> createReader();
+
+	/**
+	 * The accumulatorFilterAdditive function implements the doFilterIIR callback
+	 * for the additive accumulator filter.
+	 * @param reader The CallbackIIRFilterReader that executes the callback.
+	 * @param useless A user defined pointer that is not needed for this filter.
+	 * @return The filtered sample.
+	 */
+	static sample_t AUD_LOCAL accumulatorFilterAdditive(CallbackIIRFilterReader* reader, void* useless);
+
+	/**
+	 * The accumulatorFilter function implements the doFilterIIR callback
+	 * for the non-additive accumulator filter.
+	 * @param reader The CallbackIIRFilterReader that executes the callback.
+	 * @param useless A user defined pointer that is not needed for this filter.
+	 * @return The filtered sample.
+	 */
+	static sample_t AUD_LOCAL accumulatorFilter(CallbackIIRFilterReader* reader, void* useless);
+};
+
+AUD_NAMESPACE_END