And yes, Tommy, I still believe you are on the right track...

I still personally think that the issue is FAR more a style programming and lack of fills issue than anything in the OS. Simply the fact that it is not noticed on many styles on the newer Korg's points to Korg making more of an effort to ensure their style makers don't try to make the fills so different from the variations, but the lack of fills (although there are three, the vast majority of styles use one as a break/fill, so you really only have two) is the primary culprit...

There is just NO WAY you can get two fills to be smooth on four Variations, especially as varied as Korg often make the variations. I've already said that I think that, were Roland or Yamaha to still only have two on their current line-up, you would have the same problems (and can hear it on translated styles from Korg).

But Roland have seven, Yamaha six (real fills, that is). You REALLY need twelve for there to be a one to one on possible routes, but six or seven mitigates the problem to the point of unnoticeability (for the most part). This, I feel, is all Korg need to do to fix the problem. As long as the BEGINNING of a fill matches fairly closely the variation it comes from, you don't hear 'jumps' or 'glitches'. But when it struggles in this area, you can't help but notice it.