You don't... the tascam is a stand alone by itself... It has only 2 inputs, and two outputs... which means that you can bring tracks in two at a time and and mix up to eight (I think, without looking again) but can only send out two channels at a time... Usually this would be your final mixdown out of the tascam mixer... It's really not designed to be used as a hard drive recorder interfacing with an outboard mixer... You'd really need a recorder with direct ins on multiple channels...i don't even think i need a stand alone mixer for what i do.