Here is what Rob Sherratt has just posted over at Korg forums. Rob is probably the man with the most knowledge about Korg arrangers - and he is the man behind the great Korg instructional dvds:

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Hello Lee and Rikki,

Here is a theory:

a) The style trigger problem is not evident at all on the Pa1x.

b) The problem is only evident on the Pa800/ Pa2x with styles that use guitar mode for one or more of the tracks. The problem was introduced at the time the first guitar mode styles were launched.

c) The problem is caused because the "guitar mode" control signals are not parsed correctly by the style play software "back in time" by software when you trigger the fill or variation change.

Let me know if your testing of different styles supports this theory?

Though God knows why we are doing the test and diagnosis of Korg software bugs for them. They should just acknowledge the problem report, give it a trouble ticket number, and say it will be attended to in the next software release.

Best regards,
Rob

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This could be good news since it should be possible for Korg to fix the guitar mode algorithms relatively easily - maybe they have done it already in OS 2.0?

This can also explain why it is so difficult to reproduce the problem on the Pa800 since the Pa800 has very few guitar mode styles. Of the four styles AJ used only "Real 16 Beat" uses guitar mode on the Pa800.

Kind regards,
Tommy