It is OS problem.I don't know what is Korg doing with this and why.My pa600 locked few times.Not like Dave explained.My would lock when I edit some style.I can still play but I can't change the screen .I don't know if they fixed with new OS.I still have to install it.
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MIKIMIKI

TYROS 5,BEHRINGER X32PRODUCER,YAMAHA DSR112,JBL PRX618s XLF,EV ZLX12p,SENNHEISER E945,....ETC