llPlaySoundSlave(string sound, float volume)

Behaviour is identical to llPlaySound, unless there is a "sync master" (set with llLoopSoundMaster) present and already playing, the slave sound will not be played until the master hits its loop point and returns to the beginning. This function will play the sound exactly once; if it is desired to have the sound play every time the master loops, either use llLoopSoundSlave, with extra silence padded on the end of the sound, or ensure that this function is called at least once per loop of the master.

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Sounds | Functions