emit_sound.
The before last param, it's for flags.
Available flags are (from amxconst.inc) :
Code:
#define SND_SPAWNING (1<<8) // we're spawing, used in some cases for ambients
#define SND_STOP (1<<5) // stop sound
#define SND_CHANGE_VOL (1<<6) // change sound vol
#define SND_CHANGE_PITCH (1<<7) // change sound pitch
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