I have a gently-used VT Deluxe that suddenly dropped the B channel - no signal, no noise, nothing on any of the three selectors. The battery has maybe an hour's use, I don't stomp any of the selector buttons; it just lost the B channel. Anyone have a similar experience or a remedy? It's under warranty but if there's something I can/should check first, I'd rather go that route. Thanks! Added: I run 1/4" into the A/B input, then 1/4" out into the main input on my amp, which worked fine until now. I don't run any effects loop voodoo.