So I screwed up and didn't realize the amp was on. I removed a compressor from the effects loop, the amp made a loudish pop and then made no sound. I turned it off and on and now it makes sound but the volume fades in and out while I'm playing. It's a mid 80s GK 400rb. How bad did I screw up? Is it fixable or should I be amp shopping? Thanks in advance for any help.