This function returns the current gain (volume) set for the given audio emitter, normally between 0 and 1, where 0 is silent and 1 is full volume. Note that on some platforms you can have a gain of greater than 1, although a value of 1 is considered "full volume" and anything greater may introduce audio clipping.
|emitter||The index of the emitter to use.|
if audio_emitter_get_gain(emitter_player) < 1
The above code checks the current gain of a given emitter and if it is less than 1 it is set to 1.