The ReverbSoundEffect simulates the effect of sounds bouncing off of several surfaces (such as walls in a room), which causes several overlapping echoes that arrive at the listener at slightly offset times.
Range: 0.1 to 20 (default 1.5) Sets how long it takes for the reverberating echoes to fade out completely. Larger decay times simulate larger (empty) spaces
Range: 0 to 1 (default 1) Controls how many reflections are generated.
Range: 0 to 1 (default 1) Controls how smooth and reflective the simulated surfaces are. The lower this value, the more discrete the echoes are. At higher levels the echos will blend more.
Range: -80 to 10 (default -6) The output volume of the original sound.
Range: -80 to 10 (default 0) The output volume of the echoed effect.