Give this a listen and a read. Although it's Roland and a keytar, the principle is the same...
http://www.roland-arranger.com/smf/inde ... pic=1935.0
The trick is to use Pianostyle chord recognition, which only changes chords if you play 3 notes or more. So, with practice, you can chord where you need the changes, then solo using only one or two notes tops (this takes practice!) and you don't freak out the chord recognition section.
Plus, with a PA3X (or a BK-9!), you can make one pass of the head of the tune with the Chord Sequencer in Record, hit 'Play' (you can set this up on the footpedal unit if you have one, on a Korg), and then solo your brains out until you want a different section (if the tune has a repeated vamp or solo section).
Personally, I wouldn't try playing full two handed on the keytar (you lose the use of the bender strip, which is the main reason to use one!) in split mode, it's a bit awkward, but if you feel comfortable, I suppose it could work...
Keytar's are immense fun, and help you step out from behind the 'wall' and get a bit of the spotlight...
