void S_StopChannel (unsigned int channel_ind, qboolean lockmutex);
qboolean S_SetChannelFlag (unsigned int ch_ind, unsigned int flag, qboolean value);
void S_SetChannelVolume (unsigned int ch_ind, float fvol);
+float S_GetChannelPosition (unsigned int ch_ind);
void S_BlockSound (void);
void S_UnblockSound (void);