I did a bunch of research on compressors, and my local GC had the one I wanted, the Markbass Compressore (Which I now own and love). The pedal comes with its own adapter, but the employee I was dealing with grabbed some random 12 v adapter to accompany it. The pedal starts smoking and a burning smell enters the air. He panics and unplugs it, then goes to get another of the same pedal with the adapter. So I'm standing there and testing the pedal out. He starts asking me questions about compressors.... Are you kidding me? I gave him a half hour lesson on what threshold and ratio mean. GC needs to take a long hard look at its help.