That is really useful info you provided there!
Yes I've tried to use the voice chip test... (ext funct -> 7 -> enter -> enter (while "0" on display)) and then hit a note 6 times to run through the voices. I have the pitch error on all the voices... But then I did a Calibration, and after that an initialization and now the pitch problem is gone. It seems as if I have to redo it now and then (unreasonably often in my opinion). Is the calibration etc saved in memory and disappears if there is a problem with the battery? But the factory presets 200-> etc seem intact so shouldn't they disappear aswell if there is some problem with the battery? What could cause it to go back to being un-calibrated so quickly?