Yamaha QY700 Owner's Manual page 170

• If the song contains "GM Mode On", "XG System On", or
control change or exclusive messages which set program
changes, the settings of Voice mode will be ignored.
• If you want your Voice mode settings to be reflected in the
data, highlight the XG Header item in the Save page of Disk
mode when saving the song to a Standard MIDI File etc.
( p.307)
Chapter 3. VOICE MODE
About voice mode
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