@patryktylza
I think in many situations it may be sufficient to use the side chain without a second channel, since the side chain feature of the compressor allows
- the channel itself to be the side chain source (“self keyed”) and
- to apply a HPF to the side chain signal.
Therefore, if you enable the side chain filter with HPF at lets say 6kHz, you can let the compressor only react to frequencies over 6kHz. Everything below won’t trigger the compressor. I used this approach lately and it worked out great. The only downside I see is that you are limited to a HPF and can’t choose a specific frequency to trigger the compressor. But in exchange for this drawback you have a much simpler setup. And if you need another compressor for “normal” compression you could then again route the signal to a group and compress there.