Sorry you're going through this, thanks for letting us know.

I don't believe Casio made very many of these. I also don't think sales took off like they planned. Even so, they have been adamant about holding the line on price. I haven't seen any blowouts anywhere. So if I'm right, there are dozens sitting in warehouses which are slowly turning themselves into bricks.

Other than the bug being in the mixer, can you be more specific about symptoms of the problem (or maybe you already posted it on Casio music forums??) If I ever come across one of these, I would like to know what to look for.

One more thought... Some parts of this OS are used in the new CT-X series. And a variation of the software driving the touch screen is used in the PX-560 style piano. So depending on the cause, it's in Casio's interest to get this bug solved.

O/T but I'm not sure that a PX-560 successor couldn't unseat the Korg Havian and Clavinova to be an elite piano arranger. It would give Casio a MOTL arranger with better quality (albeit piano) keys than the MZ-X or CT-X.