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Side-chain filter can be nice if either your source (or the crosstalk you’re trying to exclude) are in a relatively narrow frequency band. For example, on a rack tom you might set the filters to only allow the fundamental frequency of the tom into the sidechain, so that the gate won’t open up if the neighbouring rack tom, or a nearby cymbal gets hit.

With regard to gates on vocals… I haven’t found them to be all that useful on vocals to be honest. If I’m getting enough bleed into a mic that I’m tempted to use a gate, it’s usually because I’m trying to put a lot of gain on a vocalist with a weak voice or poor mic technique, and it’s almost impossible to set the threshold to reliably get the vocal without the gate also opening up all the time due to stage volume.