Isolated amount having a volume effect

Relevant issue: https://github.com/michail-nikolaev/task-force-arma-3-radio/issues/521

Would still like to include an audio effect similar to the underwater effect for heavily but not completely isolated vehicles.
Looks like it should be 

 volumeFromDistance(serverConnectionHandlerID, data, d, shouldPlayerHear) * (1.0f - volumeMultiplifier(vehicleVolumeLoss))); 

because gain is not linear to human ear