@Diki I am assuming you mean Korg PA 3x-4x and then 4x-5x?

I don't ever remember the 3x having issues after release. I bought a PA3x very early on after initial release into Australia and don't remember them (Korg) having to issue bug fix updates as they had to do with the 4x and 5x.
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Roland G70 / Roland BK9 / Roland GW8-L / Yamaha Motif XS / Technics KN6500