How do you "sidechain" with an SL16.4.2Ai mixer? The manual indicates it can be done in VSL-Ai, and SL-Remote-Ai, but is unclear on exactly how to do this. When I hold a "Left" click in the "Key Listen" button in UC, nothing happens. I expect the other channel "Select" buttons to be flashing, similair to what happens with an SL24/32.4.2Ai when "sidechaining".
Am I missing something?