Yamaha MU80 Owner's Manual page 117

General MIDI (GM Init)
Computer Music (C/MInit)
Performance (PFMInit)
One of the four parameters above will be available, depending on the cur-
rently selected Sound Module mode: XG, TG300B, C/M or PFM. Ini-
tializing this parameter restores the original settings for the selected mode.
NOTES
For the PFMInit setting, only the currently selected Performance will be initialized.
For XGInit and GM Init, the initialized settings are the same as when the MU80 is reset
upon receiving an XG System On or GM System On message.
Drum (DrumInit)
UTILITY MODE
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