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diff --git a/src/s_sound.h b/src/s_sound.h
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+/* Emacs style mode select   -*- C++ -*-
+ *-----------------------------------------------------------------------------
+ *
+ *
+ *  PrBoom: a Doom port merged with LxDoom and LSDLDoom
+ *  based on BOOM, a modified and improved DOOM engine
+ *  Copyright (C) 1999 by
+ *  id Software, Chi Hoang, Lee Killough, Jim Flynn, Rand Phares, Ty Halderman
+ *  Copyright (C) 1999-2000 by
+ *  Jess Haas, Nicolas Kalkhof, Colin Phipps, Florian Schulze
+ *  Copyright 2005, 2006 by
+ *  Florian Schulze, Colin Phipps, Neil Stevens, Andrey Budko
+ *
+ *  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., 59 Temple Place - Suite 330, Boston, MA
+ *  02111-1307, USA.
+ *
+ * DESCRIPTION:
+ *      The not so system specific sound interface.
+ *
+ *-----------------------------------------------------------------------------*/
+
+#ifndef __S_SOUND__
+#define __S_SOUND__
+
+#ifdef __GNUG__
+#pragma interface
+#endif
+
+//
+// Initializes sound stuff, including volume
+// Sets channels, SFX and music volume,
+//  allocates channel buffer, sets S_sfx lookup.
+//
+void S_Init(int sfxVolume, int musicVolume);
+
+// Kills all sounds
+void S_Stop(void);
+
+//
+// Per level startup code.
+// Kills playing sounds at start of level,
+//  determines music if any, changes music.
+//
+void S_Start(void);
+
+//
+// Start sound for thing at <origin>
+//  using <sound_id> from sounds.h
+//
+void S_StartSound(void *origin, int sound_id);
+
+// Will start a sound at a given volume.
+void S_StartSoundAtVolume(void *origin, int sound_id, int volume);
+
+// killough 4/25/98: mask used to indicate sound origin is player item pickup
+#define PICKUP_SOUND (0x8000)
+
+// Stop sound for thing at <origin>
+void S_StopSound(void* origin);
+
+// Start music using <music_id> from sounds.h
+void S_StartMusic(int music_id);
+
+// Start music using <music_id> from sounds.h, and set whether looping
+void S_ChangeMusic(int music_id, int looping);
+
+// Stops the music fer sure.
+void S_StopMusic(void);
+
+// Stop and resume music, during game PAUSE.
+void S_PauseSound(void);
+void S_ResumeSound(void);
+
+//
+// Updates music & sounds
+//
+void S_UpdateSounds(void* listener);
+void S_SetMusicVolume(int volume);
+void S_SetSfxVolume(int volume);
+
+// machine-independent sound params
+extern int default_numChannels;
+extern int numChannels;
+
+//jff 3/17/98 holds last IDMUS number, or -1
+extern int idmusnum;
+
+#endif