Wow, it's hard to believe that Korg has put out a product with that problem. The mic input sounds unusable. I don't get mine until tomorrow, and will let you know how I get on.

Try posting the problem on the Korg Pa900 forum site, I know Paolo Trammonini from Korg Italy reads those posts.
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Graham, Korg Pa1000, Korg G1 Air, Countryman E6, Roland BA330, 2 x Roland CM-30, , Mackie SRM150