I have a Fender Champion 30 with DSP that I picked up for 20 bucks with an issue with the FX switch. First of most of the time I can plug my guitar in and the Amp itself works and sounds clean but after playing for about 30 minutes or so it sounds like the vibrato effect kicks on. This sounds also happens instantly if you turn either of the FX knobs. If I give the amp a good slap on the side it goes away. What I would really like to know is if there is a way to bypass the FX all together as I have no need for it.