Pretty easy. The 1/4 in. jacks on the top correspond to the channels below, labeled 1 thru 8 on top and 9 thru 16 on the bottom. Example, Plug into jack 1, press "INPUT SEL" press "DIRECT REC TRK". Now you can either choose "CH STATUS/CH SEL (the buttons above the faders) 1 on the top, or 9 on the bottom. Press record to moniter, press record and play to start recording. Use the trim to adjust.. Hope that helps. Good luck.
FX