My manual says:
Standard MIDI files with these types of lyrics can be displayed.

1) Solton
2) M-live(Midisoft)
3) Tune 1000
4) Edirol
5) GMX
6) HitBit
7) XF

Standard MIDI files usually have the .MID or .KAR extension

You can also do your own .TXT and name it the same and put it in the same directory as the midi file (or MP3) and it will display the text for you (manual page turn)

That's what I know for sure....

Lee