hi, the compressor has no key input, the sidechain is triggered by the whole of the signal, you can only set the prefiltering of the signal with the lpf hpf hit and i think there is one more setting… you could use the lfo or p locks for some in depth programming, but that can only emulate sidechain and can be a bother for non repetitive material… and mostly unusable with a live rhythm input…

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