Odregos

I have a pod hd 400. one output goes to a fender amp and the other to a marshall amp. I am currently using an external aby switch. I would like to be able to adjust the amount of signal going to each amp by adjusting the pan. Ideally it would be cool to assign the pan to the foot pedal. So far I have not found any pan options whatsoever on the Pod HD400. Also are there any patches that could make the pod hd400 act like an ab switch? Thanks