After scouring the net for about a week now, I've determined the only feasable way to get a footswitch for my Concert Lead is to build my own. I know on the distortion channel, one of the connections is for distortion and one is for boost. On the reverb side, I know one connector is for reverb, but what is the other one for??? If it has no connection, I'll simply build a three button footswitch instead of four buttons. I checked out the schematic for the concert lead, and only saw three footswitch connectors, but the schematic may have been for the newer (black & red faced) model, while I have the earlier (silver & black) model. Could this possibly be an unused connector on the back of my amp???