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diff --git a/extern/audaspace/include/generator/Sine.h b/extern/audaspace/include/generator/Sine.h
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+++ b/extern/audaspace/include/generator/Sine.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 Sine.h
+ * @ingroup generator
+ * The Sine class.
+ */
+
+#include "ISound.h"
+#include "respec/Specification.h"
+
+AUD_NAMESPACE_BEGIN
+
+/**
+ * This sound creates a reader that plays a sine tone.
+ */
+class AUD_API Sine : public ISound
+{
+private:
+	/**
+	 * The frequence of the sine wave.
+	 */
+	const float m_frequency;
+
+	/**
+	 * The target sample rate for output.
+	 */
+	const SampleRate m_sampleRate;
+
+	// delete copy constructor and operator=
+	Sine(const Sine&) = delete;
+	Sine& operator=(const Sine&) = delete;
+
+public:
+	/**
+	 * Creates a new sine sound.
+	 * \param frequency The desired frequency.
+	 * \param sampleRate The target sample rate for playback.
+	 */
+	Sine(float frequency,
+					 SampleRate sampleRate = RATE_48000);
+
+	/**
+	 * Returns the frequency of the sine wave.
+	 */
+	float getFrequency() const;
+
+	virtual std::shared_ptr<IReader> createReader();
+};
+
+AUD_NAMESPACE_END