A harp playing friend brought over his new ISP Decimator to try out with a 10W tube amp I built. From what I can tell this thing is a fancy noise gate. He bought it to combat a feedback problem he usually experiences at the gain he likes to run - I understand this is a common problem with harmonica players. The thing does seem to work. But I noticed a click or pop whenever it was switched out, i.e. bypass. This is not normal. No pedal should do this right?