Sets parameters that control how the volume of the Source falls of with distance.
Only mono sources support positional falloff. Using this function on a stereo Source will cause an error.
Source:setFalloff(reference, max, rolloff)
|reference||number||The distance at which the volume will start to decrease.|
|max||number||The distance at which the Source will be its quietest.|
|rolloff||number||How quickly the sound falls off between the reference and max distances (1.0 is the default).|