I just acquired a Microverb and Rolls Midi Buddy board. When I am playing and switch channels I get a "pop". When I am not playing it is find when switching. It also does it from the face when I change banks while playing(actualy my guitar player switched it, two hands you know). The Microverb was used but it looks brand new. I also get the same "POP" when I use a footswitch to bypass the Microverb. Is this standard? I am just finally getting into midi and have no idea how quiet this should be.