Using headphones to monitor traktor
I have a DJIO external soundcard on my macbook that is setup with the right audio outs to monitor and the right ones to master, so that I hear both fine. I want to be able to set the headphones (monitor) to listen to deck b when the crossfader is all the way to deck a, so that I can do useful stuff like lay beat grids and cue points while playing on deck a (and be able to hear where I am laying what). Can someone please explain how to do this if it is possible, or point me on a guide to tips/advice on using the monitor (headphones) effectively when working live.
Thanks,
Matt