Do you have a set of dice?
For me, the primary difference (others will all have their own preferences) between the 2x and the 3x was the increase in fills from 2 (plus a break/fill) to 4 (+b/f). This radically improved the 'smoothness' of the transitions between Variations, IMHO. Plus there is an 'Auto-Fill' system like most other arrangers have, now, so simply selecting the Variation automatically selects the best fill to get from one to the next...
Korg still trail a bit in this regard (Roland have six fills in the BK series, Ketron have up to four different break/fills), but it was a very noticeable difference, for me at least. Hopefully, this trend continues.
