Hi Dan,
be interesting to see how you go with the korg format.
Pre or Post Guitar Mode?
Guitar Mode 1 (PA2X)
Guitar Mode 2 (PA3X)
Guitar Mode 1.These aren't normal midi tracks. Single Notes actually create strums. Chord Changes for Intro's & Endings are created via note velocity.
Guitar Mode 2 as above, but with the addition of midi notes in Guitar Mode tracks.

The earlier pre guitar mode styles were more simple.
When viewed in a pc sequencer they are quite similar to psr styles.