Hi, thanks. I was just replying to a particular enquiry about the sound changes on the 4 variation buttons using KN5000 styles on the KN2600.
The sounds do change if you press the Panel Memory 1-4 (the rhythm remains the same).
The rhythm changes using the Variation 1-4, with or without using the Music Arranger (music arranger enables Fill In 1 & 2 to go back/advance respectively).