I drew a blank the other day when a Behringer FS112B Dual Amp Selector Footswitch was swung in my direction and I was asked what it it and where did you plug it in by one of my students. "I've never used one. I dunno. Do you have the manual?" was my reply. Nope. He didn't. SO, after unsuccessfully googling it, I am eventually posting the query here - any ideas where I might get a manual on this? or some Idiots Guide to using one?