Hidden PMM Display Patterns (like $Title$ or $Track$) for Playlist?

[BioBob]

In the Phatnoise Music Manager, theres a couple options for Display Patterns, such as: $Title$ - $Artist$ - $Album$ - $Track$, which would display "Until It Sleeps - Load - Metallica - 04" based on mp3 tags.  $Name$ isnt listed as an option there, but basically displays the Filename, like "song.mp3".

Are there any hidden Display Patterns that show the Disc Name?  (Disc Name being the name of the disc as listed in the Phatnoise Music Manager) or other hidden stuffs?  Or maybe a list of all the hidden stuff we can dig out?