On my Rack (current OS) and remote, I have a Mission expression pedal dedicated to wah. I get this odd, totally random sonic event where, regardless of the rig I'm using, i'll get a momentary tone change that sounds like the wah in toe-down mode (high treble tone). It last a second or two, then returns to normal. I've calibrated the pedal several times, it's set to bypass at stop. I've check the cables/plugs. It sounds great when used, but this random sonic event is annoying.