Graham, you forgot: Multipads, Songs, and MusicFinder type files.

Your method is nearly identical to what I did. I created main directory folders with these names:

Midi Songs
Multi Pads
Music Finder
Song Regist
Song Styles
Styles
User Mem Backup
Voices

Of course the contents of each of these folders is only assessible when this main directory folder page is accessed from it's associated category (song, style, voice, multipad, regist) from the MAIN LCD page.

- Scott