|listenerIndex||The index of the listener to set the gain on.|
|gain||Value for the global volume (0 to 1).|
With this function you can set the absolute value for the global
volume of all sounds and music for a specific listener. The default
listener index is 0, but you can use the function audio_get_listener_info
to get the different indices available for the target platform. The
gain value is based on a linear scale from 0 (silent) to 1 (full
volume) and will affect the relative volume of all sounds and music
played from within your game through that listener.
var num = audio_get_listener_count();
for( var i = 0; i < num; i++;)
var info = audio_get_listener_info(i);
audio_set_master_gain(info[? "index"], 0.75);
The above code loops through the available listeners and then sets their master gain to 0.75.