Calculates the quadratic distance from speakers in 2D or 3D.
If the smooth option is off, Calculation can be done in several modes:
Speaker X position.
Speaker Y position.
Speaker Z position.
Source X position.
Source Y position.
Source Z position.
Calculated volume coefficient according the distance.
Area of speakers.
Determines if the volume or envelop changes smoothly (ON), or abruptly (OFF).