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diff --git a/engines/mortevielle/sound.h b/engines/mortevielle/sound.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.
+ *
+ */
+
+/*
+ * This code is based on original Mortville Manor DOS source code
+ * Copyright (c) 1987-1989 Lankhor
+ */
+
+#ifndef MORTEVIELLE_SOUND_H
+#define MORTEVIELLE_SOUND_H
+
+#include "audio/audiostream.h"
+#include "audio/mixer.h"
+#include "common/mutex.h"
+#include "common/queue.h"
+
+namespace Mortevielle {
+class MortevielleEngine;
+
+typedef int tablint[256];
+
+/**
+ * Structure used to store pending notes to play
+ */
+struct SpeakerNote {
+	int freq;
+	uint32 length;
+
+	SpeakerNote(int noteFreq, uint32 noteLength) {
+		freq = noteFreq;
+		length = noteLength;
+	}
+};
+
+/**
+ * This is a modified PC Speaker class that allows the queueing of an entire song
+ * sequence one note at a time.
+ */
+class PCSpeaker : public Audio::AudioStream {
+private:
+	Common::Queue<SpeakerNote> _pendingNotes;
+	Common::Mutex _mutex;
+
+	int _rate;
+	uint32 _oscLength;
+	uint32 _oscSamples;
+	uint32 _remainingSamples;
+	uint32 _mixedSamples;
+	byte _volume;
+
+	void dequeueNote();
+protected:
+	static int8 generateSquare(uint32 x, uint32 oscLength);
+public:
+	PCSpeaker(int rate = 44100);
+	~PCSpeaker();
+
+	/** Play a note for length microseconds.
+	 */
+	void play(int freq, uint32 length);
+	/** Stop the currently playing sequence */
+	void stop();
+	/** Adjust the volume. */
+	void setVolume(byte volume);
+
+	bool isPlaying() const;
+
+	int readBuffer(int16 *buffer, const int numSamples);
+
+	bool isStereo() const	{ return false; }
+	bool endOfData() const	{ return false; }
+	bool endOfStream() const { return false; }
+	int getRate() const	{ return _rate; }
+};
+
+class SoundManager {
+private:
+	MortevielleEngine *_vm;
+	Audio::Mixer *_mixer;
+	PCSpeaker *_speakerStream;
+	Audio::SoundHandle _speakerHandle;
+public:
+	SoundManager(Audio::Mixer *mixer);
+	~SoundManager();
+
+	void setParent(MortevielleEngine *vm);
+	void playNote(int frequency, int32 length);
+
+	void decodeMusic(const byte *PSrc, byte *PDest, int NbreSeg);
+	void litph(tablint &t, int typ, int tempo);
+	void musyc(tablint &tb, int nbseg, int att);
+};
+
+} // End of namespace Mortevielle
+
+#endif