I don't know if anybody is still around and even owns an A6, but I have the exact same problem as "Lord Dags" and I don't know what's causing it. First I thought it was incoming NRPN data that ableton had messed up, but that's not it (verified by Midi-ox on another computer). Somebody at gearslutz said resetting ribbon cable in the synth is supposed to fix this, but what was your fix?