I have a KN6500 (bought second hand a couple of weeks ago, so not really up to speed with the workings as yet) which was playing OK until last night. All of a sudden it sounds as though all the chords are flat and throws out the whole tune. I have been using floppy discs - saving from my tutor's keyboard (KN6500 too) she has a hard disc. Can anyone please help, I've looked in the book but can't find anything that might relate to it.