Calculates the quadratic distance from speakers in 2D.
If the smooth option is off, Calculation can be done in several modes:
Speaker X position.
Speaker Y position.
Source X position.
Source Y position.
Area of speakers.
Calculated volume coefficient according the distance.
Determines if the volume or envelop changes smoothly (ON), or abruptly (OFF).
version 5.2.221206
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