+sfx_t *S_PrecacheSound (const char *sample, qbool complain, qbool levelsound);
+float S_SoundLength(const char *name);
+void S_ClearUsed (void);
+void S_PurgeUnused (void);
+qbool S_IsSoundPrecached (const sfx_t *sfx);
+sfx_t *S_FindName(const char *name);
+
+// these define the "engine" channel namespace
+#define CHAN_MIN_AUTO -128
+#define CHAN_MAX_AUTO 0
+#define CHAN_MIN_SINGLE 1
+#define CHAN_MAX_SINGLE 127
+#define IS_CHAN_AUTO(n) ((n) >= CHAN_MIN_AUTO && (n) <= CHAN_MAX_AUTO)
+#define IS_CHAN_SINGLE(n) ((n) >= CHAN_MIN_SINGLE && (n) <= CHAN_MAX_SINGLE)
+#define IS_CHAN(n) (IS_CHAN_AUTO(n) || IS_CHAN_SINGLE(n))
+
+// engine channel == network channel
+#define CHAN_ENGINE2NET(c) (c)
+#define CHAN_NET2ENGINE(c) (c)
+
+// engine view of channel encodes the auto flag into the channel number (see CHAN_ constants below)
+// user view uses the flags bitmask for it
+#define CHAN_USER2ENGINE(c) (c)
+#define CHAN_ENGINE2USER(c) (c)
+#define CHAN_ENGINE2CVAR(c) (abs(c))
+
+// S_StartSound returns the channel index, or -1 if an error occurred
+int S_StartSound (int entnum, int entchannel, sfx_t *sfx, vec3_t origin, float fvol, float attenuation);
+int S_StartSound_StartPosition_Flags (int entnum, int entchannel, sfx_t *sfx, vec3_t origin, float fvol, float attenuation, float startposition, int flags, float fspeed);
+qbool S_LocalSound (const char *s);
+
+void S_StaticSound (sfx_t *sfx, vec3_t origin, float fvol, float attenuation);
+void S_StopSound (int entnum, int entchannel);
+void S_StopAllSounds (void);
+void S_StopAllSounds_f(struct cmd_state_s *cmd);
+void S_PauseGameSounds (qbool toggle);
+
+void S_StopChannel (unsigned int channel_ind, qbool lockmutex, qbool freesfx);
+qbool S_SetChannelFlag (unsigned int ch_ind, unsigned int flag, qbool value);
+void S_SetChannelVolume (unsigned int ch_ind, float fvol);
+void S_SetChannelSpeed (unsigned int ch_ind, float fspeed);
+float S_GetChannelPosition (unsigned int ch_ind);
+float S_GetEntChannelPosition(int entnum, int entchannel);
+
+void S_BlockSound (void);
+void S_UnblockSound (void);
+
+int S_GetSoundRate (void);
+int S_GetSoundChannels (void);
+int S_GetSoundWidth (void);