There is a variation in the buzz when I play so signal is there. The buzz is SO loud and invariant that I can't say if the guitar notes are there (probably are) or the input is just perturbing the buzz.
Thanks for the advice on cooling down and unplugging. I've been around electronic stuff for a long time, but ya nver know. There tooooo many stories of folk geeting zapped messing with live stuff when they didn't have to. The warnings are always warranted.
Thanks