There's no initialisation. You can reset the machine completly by pressing

[EXIT] + [DSP4~7] + [SLOW/FAST]
while turning power on.
NOTICE!
All Data from Flash Memory will be lost!
Please backup all your data on Disks or HD before using this option.

If you simply ask for a MIDI-Reset:
You don't need one like Roland. The Machine always runs in GM Mode, if no XG-Header is available in a Midifile.