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diff --git a/engines/agi/sound_coco3.h b/engines/agi/sound_coco3.h
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+/* ScummVM - Graphic Adventure Engine
+ *
+ * ScummVM is the legal property of its developers, whose names
+ * are too numerous to list here. Please refer to the COPYRIGHT
+ * file distributed with this source distribution.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#ifndef AGI_SOUND_COCO3_H
+#define AGI_SOUND_COCO3_H
+
+#include "sound/audiostream.h"
+
+namespace Agi {
+
+struct CoCoNote {
+	uint8  freq;
+	uint8  volume;
+	uint16 duration;    ///< Note duration
+
+	/** Reads a CoCoNote through the given pointer. */
+	void read(const uint8 *ptr) {
+		freq = *ptr;
+		volume = *(ptr + 1);
+		duration = READ_LE_UINT16(ptr + 2);
+	}
+};
+
+class SoundGenCoCo3 : public SoundGen, public Audio::AudioStream {
+public:
+	SoundGenCoCo3(AgiEngine *vm, Audio::Mixer *pMixer);
+	~SoundGenCoCo3();
+
+	void play(int resnum);
+	void stop(void);
+
+	// AudioStream API
+	int readBuffer(int16 *buffer, const int numSamples);
+
+	bool isStereo() const {
+		return false;
+	}
+
+	bool endOfData() const {
+		return false;
+	}
+
+	int getRate() const {
+		// FIXME: Ideally, we should use _sampleRate.
+		return 22050;
+	}
+};
+
+} // End of namespace Agi
+
+#endif /* AGI_SOUND_COCO3_H */