Цитата из официального описания:
When we say “sidechain” we usually are referring to controlling the gate from an external signal—for example, having a gate being used on a bass guitar open and close in response to the signal provided by the kick drum. The Sonitus fx:gate sidechain doesn’t accept an external trigger signal, but it does allow you to use the high and low cut filters on the incoming audio to create a “sidechain trigger signal”. How is this useful you may ask? Live drum mics come to mind. Perhaps the kick drum microphone has also picked up a lot of the snare drum sound. You’ve tried to gate the snare out of the kick drum signal using the basic settings, but it is still loud enough to occasionally trigger the gate. You find that setting the gate to eliminate the snare bleed also causes some of the kick drum hits to be lost. In this case, use the low cut and high cut sliders to determine what frequencies should trigger the gate. Setting the filters does not affect the audio passing through the gate, only the sidechain signal that is used to trigger it, so you can find a setting that allows the kick drum to pass, but silences the snare drum bleed!