Hi guys. I'm Adam from Poland. Having POD XT since I bought in 2006 being in Miami. Few weeks ago during performance I noticed the volume pedal didn't work - in every position the volume was high or there was no sound at all. When I kicked the pedal with my foot it started work normally for a very short period of time. So I decided to disassemble my unit. The optical sensors looked fine, anyway I cleaned it out with the soft cloth - but this was not a reason. Accidentally I touched the 6 or 7 line cable that connects the pedal board with the main board. The POD XT was still powered and I heard in the headphones some crackles. The plug was secured on the pedal board with the hot glue. I removed it and unconnected the cable. I cleaned the contacts pins, put it back together and secured it back with the hot glue. I think sometime you need to squeeze the contacts (not too strong!) where the pins come in to make the signal come through. At evening when I played 4 hrs gig there was no problem with the volume pedal (nor with the Wah effect). The small problem occurred when the pedal was in the hill position. The volume was not utter muted - I still heard some silent sound. The pedal calibration helped out, but only until I switched the unit off and put it back on. The silent sound was still heard in the pedal hill position on every patch. Next day the problem disappeared - can't explain why... So, remember about cable too. Not only of the optical sensors. Sorry, I should have taken some pictures, but I haven't...