I have seen one where you have to set something to tell it
you want it to transmit. That was on a tres old Clavinova that a friend was trying to hook up to his PC. He did get it going eventually, and I think he had to do some futzing around with the switches on the board to put it in the right mode to do so.
Do you have the manual? His problem was solved when he finally laid his hands on one for his keyboard....
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