This is our "MDF3", Yamaha Midi Data Filer. When students
want to save all of their mixer settings to disk, they can download all Mixer
data (automix, scenen memory, FX libraries, etc .) via MIDI into this device and
save it all on a small floppy disk. Later, you can reload all your board/mixing
data from the MDF3 into the O2R mixer.