I wish I had an answer for you. Let me suggest (if someone here does not provide an answer... and a solution) that you send Yamaha an e-mail, identifying the machine you are using, the nature of the problem and specifics about what you encounter when you first turn on your arranger. If you are lucky, you might get one of the techs who gives two hoots in hell about Yamaha's Customer Base... or you may get some snark who occupies a chair and draws a paycheck to support his habit.