Some info if your thinking of upgrading......


- 24 oscillators per sound
- extra DNC features like 2 groups of circle (1 & 2) where a wave sequencing can be achieved , legato Up & Down as function
as supplement to legato function.
- Lossless sample Compression of 512 Mb to fit at 256 ram expansion , which means double memory (so keep your compatible Ram).
MAXXAudio features are great.
The TC vocal harmonizer is outstanding - many more features.
The PA3X has much greater capacity for storing styles.
New styles are well up to Korg's great standard.
Mute & select buttons for the UPPER/LOWER parts (real-time track select).
PAD buttons now toggle on & off
Quick chord record is great (chord sequencer).
Faster loading time (battery for standby)
Auto-fill option is a bonus
(...and it looks good...

- ST-BY Ram battery with result of 90 sec booting time even with 512 Mb compressed user samples.
- Though Pa3X DAC chipset seems similar to Pa2X , output filtering designing makes the difference in sound clarity that is outstanding !
- Max audio with two important features , multi band parametric equalizer and global gain control that can be saved as preset !
- Overall mechanical structure is more qualitative than Pa2X Pro
- 76/61 versions keybed
-Though Pa3X is an arranger KB , it's the most advanced sampler in the market especially for sound development !

Reference: http://www.korgforums.com