Mesa cab. Decided to use a Boss gaytar GT-6 pedal board with my 210 and 212. Needless to say, I dunno what I did, maybe some high frequencies got a bit too loud for my 212 horn...pushed the instant reset button on the 212, the 210 horn works fine, but the 212's horn is non-responsive, but maybe I didn't notice it before? Who's had to ever reset one of these things. Might I have to replace a fuse?