I would say that is a pretty good guess.

I believe the new CVP-6** series will have them too.

We all know, not all arranger users are proficient keyboardists...many are vocalist/guitar players that want to do the OMB thing and, an arranger is easier to work with than a keyboard-less SMF player (module), and lets them record their own SMF/Wav/MP3 if they so wish.

Arranger manufactures realize there are many levels of skill and are clever enough to design an instrument to cover most, if not all stages, from the rank beginner all the way up to the very advanced player. Oscar Peterson loved his PSR-9000 Pro.

Ian