Its function is controlled by means of the mix knob.
Emports are subtracted from the line level in order to individually determine the desired reverb level for each emulated sound.
You need to be able to amplify a signal that is lower than the line level when the line level is set to zero or ground.
In practice this means that the output will have far more high frequencies than the input because the input signal cannot be detected.
In order to tame this 6add127376 hampdaph