Yamaha DX27 EN - Manual (Page 26)

5: SYS INFO
This function turns transmission and reception of MIDI SYSTEM EXCLUSIVE
INFORMATION data ON or OFF. The -1/+1 buttons are used to turn this function
ON or OFF. When this function is ON, voice parameter changes made in the DX27’s
EDIT or FUNCTION modes are transmitted in real time.
If the SYS INFO button is pressed again, the “Midi Transmit?” display will appear.
If the YES button is then pressed, then the DX27 will perform a bulk dump of all
voice data—INTERNAL voices 1 through 24. Voices 25—32 will be dumped as INIT
VOICE parameters.
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