@Nick > Well, given that the DJM-350 doesn't have a built-in soundcard, your audio will have to be sent through the CDJs when in PC mode. To use them with Traktor, you'll need to either aggregate (Mac) or use ASIO4ALL (PC) to merge the two soundcards of the CDJs into one soundcard for Traktor. There are instructions available around the 'net for how to do this.