Yamaha RY9 Owner's Manual page 76

DESIGNATING THE SYNC CLOCK - You can connect an external sequencer
to the RY9 and synchronize, or "sync" the two devices together so that their
clocks will play in perfect time with each other. The RY9 may be designated
as the "master" device, which means you should set its sync clock to
Internal, and the external sequencer's clock to MIDI. Or the RY9 may be
designated as the "slave" device, which means you should set its sync
clock to MIDI, and set the external sequencer's clock to Internal. Hold
[MODE] and press [PAGE-] once or more, if necessary, to access the Sync
function. The word "SYNC" will appear in the lower area of the LCD, along
with the current sync clock status—"INT" (Internal) or "MIDI". Press [-1] to
set the sync clock to "INT" status. Press [+1] to set the sync clock to MIDI
status.
ASSIGNING THE MIDI TRANSMIT/RECEIVE CHANNEL - You can connect a
MIDI keyboard and play the RY9's drum voices from its keyboard. Likewise,
you can play the RY9's drum voices from an external sequencer. To do so,
you must assign the RY9's MIDI channel to the same channel number as
the external device. Hold [MODE] and press [PAGE-] or [PAGE+] to access
the MIDI Channel function. The abbreviation "CH" (Channel) will appear in
the lower left area of the LCD, along with the current channel assignment
("01 ~ 16", "OFF"). Press [-1] and [+1] to assign the RY9's MIDI channel
number.
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