via ipod linux forums

It allows you to make your own piezo songs.

http://www.ipodlinux.org/Special:Module/piezomaker

Note you need rev 1377 or higher to work.

ill update with examples soon

Keys are
Scroll left and right : increase numbers
Play : Play Song you've created
Left/Right : Moves you to next button
Action : Plays current piezo beep or Appends or Deletes depending on which button you are on
Menu : exits