May Birthdays 
I dug through a few old threads and saw a few similar issues but nothing nearly as extreme.
I've been gigging with the Reverb Unit and a Fender Twin and during the set I like to switch between reverbs depending on the songs. Outboard for surf classics and onboard for the Ventures style songs. Warming up before a recent gig I turned on the Reissue tank and nearly deafened the band and early audience. It introduced a very loud hiss that went away when I toggled it off. Leaving the reverb engaged but removing the footswitch also fixed the issue.
I thought it might be the footswitch's fault but trying out 2 different footswitches and different amps gave me the same result. That being said I think I have narrowed down to the Reverb Unit.
If anyone has any advice or tips I'd love to be able to use the footswitch again.
Cheers!
