This is probably an incredibly dumb question, sorry. But I can't seem to find a firm answer. Should a footswitch be necessary to operate the vibrato on a Deluxe Reverb amp (DRRI)? I never use the footswitch, and I can swear this has never a problem in the past. I just turn the knobs and it works. Now suddenly the vibrato does not work unless the footswitch is engaged. What's up? The reverb works normally whether or not the footswitch is plugged in. But not the vibrato. I am not looking for a workaround. I am asking what is normal operation for this amp. Thanks!