XV-88, XV-3080, XV-5080: Rhythm Key Copy from Expansion Boards
The Rhythm Key Copy function cannot be used when copying from an expansion
board to the internal location. The reason is that there are various
differences between the programming of the expansion rhythm kits and those of
the XV's internal kits.
The solution is to Write the expansion kit to the user bank. You will then be
able to copy the user key to the new rhythm kit.