I'm one of those lurkers that own and use a Ketron Audya. I have one of the first models that hit the US. I've upgraded to the Ajamsonic package and have never had one problem with my Audya.
I've owned/still own Korg, Roland and Yamaha auto arrangers and the Audya is the best kept secret in the musical world.
Fortunately we have AJ here in the US for Ketron support and service.
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Musician's Theory of Relativity: E=Fb