The AJAMsonic Audya of mine is the best sounding keyboard I have ever owned, and the OS is so geared to live play. I can't imagine how it could be improved except a solid state HHD and more styles.
I know AJ could fix that, but unwilling to part with my board.
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pa4X 76 ,SX900, Audya 76,Yamaha S970 , vArranger, Hammond SK1, Ketron SD40, Centerpoint Space Station, Bose compact