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diff --git a/engines/bladerunner/audio_mixer.h b/engines/bladerunner/audio_mixer.h
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+++ b/engines/bladerunner/audio_mixer.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.
+ *
+ */
+
+#ifndef BLADERUNNER_AUDIO_MIXER_H
+#define BLADERUNNER_AUDIO_MIXER_H
+
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+
+#include "common/mutex.h"
+
+namespace BladeRunner {
+
+class BladeRunnerEngine;
+
+class AudioMixer {
+	static const int kAudioMixerChannels = 9;
+
+	struct Channel {
+		bool isPresent;
+		int  priority;
+		bool loop;
+		Audio::SoundHandle  handle;
+		Audio::AudioStream *stream;
+		float  volume;
+		float  volumeDelta;
+		float  volumeTarget;
+		float  pan;
+		float  panDelta;
+		float  panTarget;
+		void (*endCallback)(int channel, void *data);
+		void  *callbackData;
+	};
+
+	BladeRunnerEngine *_vm;
+
+	Channel       _channels[kAudioMixerChannels];
+	Common::Mutex _mutex;
+
+public:
+	AudioMixer(BladeRunnerEngine *vm);
+	~AudioMixer();
+
+	int playStream(Audio::Mixer::SoundType type, Audio::RewindableAudioStream *stream, int priority, bool loop, int volume, int pan, void(*onEndCallback)(int, void *), void *callbackData);
+	void stop(int channel, int delay);
+
+	void adjustVolume(int channel, int newVolume, int time);
+	void adjustPan(int channel, int newPan, int time);
+
+	void resume(int channel, int delay);
+	void pause(int channel, int delay);
+
+private:
+	bool isActive(int channel);
+	void tick();
+	static void timerCallback(void *refCon);
+};
+
+} // End of namespace BladeRunner
+
+#endif