Max the backing track

JOEL: For this track, let's turn the Twilight kid totally down and max out the backing vocals. ROCCO: I already was, man.
ROCCO: I get what you're doing, man, secretly recording the songs of this backing band. It's cool of you to give these kids a shot. JOEL: Oh, uh, thanks...
JOEL: So wait, if Ayok's turned down, how am I still hearing him? Isn't this room soundproof? ROCCO: It IS soundproof.
ROCCO: It is NOT shit proof... JOEL: Goddammit, he's humping the amps again... Ayok! NO! Down! DOWN!!