Yamaha SW1000XG Owner's Manual page 27

MIDI Out Filter Page on the System Setup Dialog
The Realtime Message item has been added. By checking a box, output of realtime messages can
be prevented. When the box is not checked (when output is permitted), the messages will be
output on MIDI Out port number 1 (set on the Device page of the System Setup dialog).
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Realtime message information is XGworks stop, start and song position information, and if a song is played back
on the XGworks side, that information will be sent as MIDI output in realtime. If a MIDI keyboard with a built in
sequencer is used as a tone generator, the built in sequencer in the keyboard will play back in sync with the
XGworks playback. If synchronized playback is not required, this box should be checked.
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