datkinson57

I just picked up an FB4 pedal to go with the Spider 210 I recently bought from an uncle. I plugged it in and it doesn't reliably switch between the different programmed channels on my amp. It goes to one channel pretty reliably (though not perfectly) and the others steadily worse. One channel doesn't work at all. What could this be? I don't mind soldering parts onto the board if that's what it takes... Thanks.