Sorry to hear of your dilemma Deane. I read over on the Korg PA forum the RH voices on the PA600 were set up from the factory at +1 Octave.
Where? I just had a quick look and cannot find the threads you make reference to about it being an octave higher???
I
CAN find Deanes' re being an octave lower, but as I wrote above, this is to compensate for the C4 split that is factory default...it is the same on the 76 note versions..and it mostly only applies to sounds that are selected by selecting a performance, and NOT a specific sound itself.
SO if you select a patch from a sound menu and not a perf bank, the sound loads with no octave shifts at all....