Nobody much seems to be interested, but here's the answer just in case, thanks to Michael B.s FAQs.
F.11. Assigning Song (Style or Voice) Buttons
There are 6 Song button on the main panel (next to the Preset Styles). You can use these to access a directory or a file directly with one button depress.
To set a target, depress Song and then the TOP of button 8 (View) to change from the direct view (10 songs only) to number input mode. Go to the file or directory that you are interested in and then depress the screen Memory button and one of the 6 Song buttons.
The numeric display shows 16 songs on a screen, and you can advance by 16 with the buttons to the right of the screen. I do not think there is any limit < 250 (I saved 56 to one folder and it was OK). You can select song by scrolling the screen 16 files at a time or directly by number.
DonM
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DonM