I listed this in midi as well because I feel it's a midi problem, but I'm hoping someone can give some insight; have a korg midi controller, simple but functions well; it is not sounding 3 notes in each octave - the Eb, the G and the B natural; same notes in each octave. Worked great for a long time. Happened before, I reset it was fine. Now not. I know I've seen tips about oxidation, etc but my feeling is it's something midi, as I don't get why it's the same 3 notes as the last time and the same 3 notes in each octave and other than that works great. So if anyone has any insight into maybe how those 3 notes could have turned off or something about why they stopped working I'm very grateful.