If what you say is true, this may be more a case of 'putting the cart before the horse' Possibly the reason few people use 'full keyboard' mode on the Yamaha PSRs is because it just 'doesn't work' properly. I know 'quite a few' professional piano keyboard players (including myself) who play in 'full keyboard' mode exclusively, when playing the Technics KN arranger keyboards . . . Why?! Because it WORKS !