I read this on Wikipedea
2006-01-11 by synthmdl76
To add MIDI sysex functionality to the original keyboard, the EX-800's ROM chip can replace the Poly-800's ROM chip
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2006-01-11 by synthmdl76
To add MIDI sysex functionality to the original keyboard, the EX-800's ROM chip can replace the Poly-800's ROM chip