I can't think of any... other then difference in quality..
2 grand difference!!!
there is just over 1 grand difference in price paid in Holland
Sadly the Korg forum is down... but from my head...
- Build quallity, pa4x is full metal
- 9 sliders
- more direct access buttons, for controlling styles
- 1.2 vs 5.3 GB of build in sounds
- more memory for user samples
- 76 keys option
- DSP, PA4x has more DSP power
- dual audio player