Dynamic Accomp, probably not as necessary now a days as it might have been on the old technics range. If memory serves me correctly, it played a slightly different variation of the current Variation you were using.
( if that makes sense)
That can be achieved on a korg with it’s 6 cv parts, by having slightly different style tracks and setting different chord types. Ie you get a slightly different variation depending on the chord type you play.

Good example is the Pa4x piano ballad, though personally I found it a bit unusable, too busy with some chord types , ie maj worked fine, 7 th sometimes unusable, so I edited down, now works for me , even if it is a bit more bland.