I am looking to have 20 or so panelist mics setup. Typically I would run a gate on channels and or manually adjust volume on the current speaker. Is the automix feature what I need to look at to make my job easier? Obviously having 20 mics hot in a room is going to be a tough battle with gain before feedback. Will the automix function help keep me safe? Would a gate be used in conjunction or does the automix handle it on its own. I will have limited time in the actual venue but have a good chunk of time to experiment before arriving.