MSX OPLL driver (OPLLDRV) created by Ring.

Music designed for the OPLL(YM2413) chip found in MSX's FM-PAC cartridge.


Four of the music files contain a "(work)" annotation in their 
filename (see "Yuji" folder). The usual players currently do not 
seem to play these. It is unclear whether this is just a player limitation
or if these files are incomplete garbage and should be deleted.