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when i bought this device i had os 1.01 version, than i upgraded it from Korg.com os 2.01 but it didn`t help.

Yes, me too! Not clear algorithm works. Sometimes it works correctly and sometimes not. Button, which is near to the display only works "down" and never "up". And in the manual is written very briefly... "The last position is recalled when turning the instrument on again" and nothing. :(

Korg PA2X PRO
S/N 3002151
Purchased Nov 2008
Ukraine, Kyiv

I have this problem too. It appeared suddenly