look, there might be more problems with korg styles than we realize. rob is speaking about an issue first occured after introduction of guitar mode. ok, but the styles glitches i experienced were with PA50, LONG BEFORE guitar mode.
i believe it's simply a matter of how the OS knows to commute from variation pattern to fill pattern and back. it seems there are situations when this change between different patterns simply does not happen smoothly, probably because of some "markers" that work inaccurately.
the problem i hear first happen with pa series. and it seems to be permanent, thru all of the updates and new models ever since.
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Yamaha S770, Studio One 3, EMU 0404USB, ESI, ATH, Dell. And others.