They could put the S750 guts in it, Gary...or even S910...it wouldn't have to be anything as elaborate as a Tyros4.

I think you are right in that many folks might not want the intricacies of an arranger keyboard, but "On Bass" is almost a must have for anyone using auto-accompaniment to any degree other than very simple chords. It would be fine for beginners or amateurs, but the more advanced player would like to have that option, or a player who wants to progress into more interesting chords.

Songs like A Whiter Shade of Pale and mostly anything by Elton John, or Billy Joel (to name only a few) have "On Bass" chords in them, and sound inaccurate when only root note chords are played.

The competition, Casio, has similarly priced and featured pianos that do have "On Bass". It's been available on PSR since 1992!

Maybe someday they'll add it, and I suppose Yamaha has their reasons for not having it...until then, I always make sure a buyer is at least aware of it's absence.

Ian