avg-interv: "average interval" sets the time (in ms) from which the average-level is measured.
att: "attack" opening time (in ms), please note that the incoming signal is delayed by the same amount of time.
Decay: time (ms) for shutting the gate after a detached peak.
Thresh: shifting (ms) for shutting the gate after a detected peak.
Gain: multiplier for the enveloping curve.
It's calculated like this: (thresh/100)+1, meaning: 0 doesn't shift, 100 shifts by the factor of 2.
mono: operating mode switch..
mono: both channels are summed, the curve is applied to the signal itself.
l-->r: the curve is taken only from the left channel and applied to the right channel (in this case the right channel is not delayed).
left level meter: left input signal
oscillator: gating curve.
right level meter: output signal