Sidechain compression beyond EDM pumping: ducking, key inputs and multiband sidechains
A sidechain lets one sound control how a processor treats another. Pumping kick-and-bass is the famous use, but the same routing quietly ducks guitars under a vocal, keys a gate from a drum, and, with a multiband compressor, turns down only the frequencies that clash. Here is how each version works, using the Ableton Live manual and FabFilter Pro-MB help as references.
Workflows