I have a new T4s which I use for solo gigs. My backing tracks are recorded in and played back with Mix craft, I use windows media player for break music. I am using the USB routed to Channel 4 on theT4s to play both the backing tracks and the break music. All seems to work fine except I get momentary audio drops when playing the WMP break music, backing tracks are fine an the issue is very intermitant. I have been using this set up with a sound craft sig 12 for a long time without incident.