>If you have a visual or anything else on the screen it wouldnt work, right?

It's an "screen inactivity" blanker: it watches the screen for periods of 100% stagnancy, and then blanks the screen after the user-specified period of stagnancy. This means it WILL operate even when the player is running, but only if the screen never changes (no timers, counters, visuals, scrolling titles, etc..).

The easiest way to see a demo, is to start a tune playing, go into my menus, set the timeout to 30sec, and then select the Font Display item from the menu -- wait 30 seconds, and poof.. music still playing, but screen is blank.

Actually, forget the "font display part", just sit looking at the 30 second setting screen for 30 secs.