This function creates a new audio emitter and returns the index
for it. This index should be stored in a variable for all further
functions that relate to this emitter, and then when it is no
longer needed it should be removed from memory using the function
to prevent memory leaks which may eventually crash your game.
s_emit = audio_emitter_create();
The above code creates a new audio emitter and assigns its index to the variable "s_emit".