Hi Gary,
the Korg style creator has. My prior korg to my PA800 was the i2, it was pretty basic.

You can do things like cutting a section out of a style track

You can record a just say a 2 bar drum pattern , change the bars to 8, you've automatically got an 8 bar pattern. Further more there's a drum remapper function where I could record a single track, copy to the other 3 variations, , set the mapping to a different setting for each, and each of the variations sounds different. The higher the number, the more dynamic the pattern sounds.

Or just say you have an onboard 8 bar pattern, you don't like the 4 first 4 bars, you just cut them out. You end up with a 4 bar pattern.
I found this function handy for some of the BIAB styles I did . I recorded 32 bars of BIAB & cut out sections that were repetative.

All the onboard styles are fully editable in an event list editor. Not so in my PSR1500, but maybe things have changed in the newer models.

There's probably stuff I still haven't discovered over the last 3 years that can be done as far as editing goes, I waste an awful lot of time on it, but I luv it . haahaa