Ive had the pitchfactor for 2 weeks and it was working fine till today. It hasn't moved and everything else seems to work. When i go to the diatonic setting i cant get pitch A to harmonize or create any sound. Ive tried moving the mix knob to just recognize Pitch A and nothing..Pitch B works fine. When i have the mix knob on A+B you still only hear pitch B. help??