Finally get my bass back after a couple of weeks in the shop, and I was super excited to jam with my band mates again. Now I always leave my set up at the drummers house since I have no vehicle and even though most of my gear is light, it ain't that light. Well, I guess someone tweaked with my over drive pedal and turned the gain up all the way. Now when I play through my SM-400 I plug into the high-gain input and usually set the gain on the amp somewhere around two o'clock. So I plug in, start messing around, and after a while I engage the over drive pedal. Most awful high pitched noise I have ever heard spewed out of my cab. Since my guitarist was also setting up I had no idea where the noise was coming from, so I shut off my amp but not before hearing an awful pop. After isolating the problem, I reset my pedal to how I normally have it, tried to turn my amp back on but nothing happened. So basically my question is what happened to my amp? Is it easily fixed or should I be expecting a check from the GC's warranty company? I really hope it can be fixed because I got a killer deal on the head (only $250.00!) and I know I won't be able to find anything as awesome for that price.