When tracking drums I always have trouble with hearing drummer talk, so I set up a talk back mic for him to communicate to me from drum room to control room. The problem exists when I start tracking the song, the talk back mic is also picking up the drums. Yuck, annoying! What to do? Here is the trick; I put a 1k tone on an Audio Track and create an Aux Track with the input of talk back mic. I insert a compressor on Aux track and set it hard. I then side chain that 1k tone into the compressor. Voila! When I initiate play on DAW talk back mic cuts.