I really like the KORG Songbook feature ... it is SO easy to access the set up for any song I want ... I also use it to set up a complete playlist for a gig ...
I really haven't used the PERFORMANCE function ...

Not to beat a dead horse, BUT ... my technics kn6000 was way ahead of the curve on this in that with the additional hard drive I am able to store SMFs and style set ups for individual songs, AND have 8 'PANEL MEMORY' registrations for each song if I wanted ... what a great board ...