Also, to address the question of really long variations, with semi-fills pre-programmed in them, these (to me) are of questionable value. Unless the tune you play has all the fills EXACTLY where your style puts them you are no longer in control. You are almost getting into SMF country there, but WITHOUT the advantage of not having to play the chords!

I can see 8 bar styles as very useful, 16 bars without ANY fill (that YOU control), somewhat less, but OK, I can see how some tunes might work that way, but anything longer, and you are getting into 'Song/Style' territory, where the style is only really useful for the specific song it was designed for. Might as well use SMFs with Mark/Jump points (for controlling the structure) and get back your left hand!

The feature that we all REALLY need to make very long variations work is the ability to play a fill-to-same that DOESN'T reset the loop, but just 'jumps' after the fill to the next 8 or 16 bar section in the same variation. Now THAT would be a fundamental improvement in arranger functionality....

Who's going to be the first to implement it?