The Preamp slider amplifies the input signal with a value before any
processing occurs. This can be used to influence the singleband and multiband
compressor.
The Postamp slider amplifies the output signal with a value after any
processing has occured. This is in effect a volume slider. To get a good sound,
make sure that the output bar display is never completely filled: Too loud
output means that the sound will be distorted.
compressor.