Yeah, KN3000 does also have that nice feature. As you say, not only create a fill
that is very different from ordinary fill, but also very smooth variation and a
movement in the ordinary pattern. Different for each accompvariation too.
This changes for each time you do the extra pressure, and you can adjust how hard
you have to do that extra press on keys before anything happens.
Don't remember how many different variations there is, but it sure make the little
extra to make it more live when play.

If Korg PA800 have this, maybe PA2X as well? What do Korg kall it?

GJ