And just in case its not obvious, you want a couple of patch cables connected from one of the aux outs back to the input.
Dunno about the C, but on the TI I use output pair 3 for this purpose, and patch it back to the inputs with a couple of balanced patch leads. Dunno if the C is balanced or not.
OT - For V-Synth owners (as I know theres a few here) - do the same thing - Aux out back to inputs (unbalanced patch leads) - its a way to make it a 3 osc synth
BTW - Are you into Hip-pop (or something similar) by any chance?