GMC 2007 Acadia Owner's Manual page 304

File System and Naming
The song name that is displayed is the song
name that is contained in the ID3 tag. If the
song name is not present in the ID3 tag, then
the radio displays the file name without the
extension (such as .mp3) as the track name.
Track names longer than 32 characters or
four pages are shortened. Parts of words on
the last page of text and the extension of
the filename displays.
Preprogrammed Playlists
Preprogrammed playlists that were created using
WinAmp™, MusicMatch™, or Real Jukebox™
software can be accessed, however, they cannot
be edited using the radio. These playlists are
treated as special folders containing compressed
audio song files.
Playing an MP3/WMA (In Either the DVD
or CD Slot)
Insert a CD-R or CD-RW partway into either
the top or bottom slot, label side up. The player
pulls it in, and the CD-R or CD-RW should
begin playing.
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Depending on the format of the disc, a softkey
menu appears and allows navigation of the disc.
The menu reads left to right as RDM (Randomize
song play order), a Folder icon with left and
right arrows (to move up or down through available
folders), a PL tag if the disc has a Playlist available,
and a Music Navigator tag. If a Playlist tag is
shown, toggling this key brings up a Folder softkey
only or the menu as previously described.
If the ignition or radio is turned off with a CD-R
or CD-RW in the player, it stays in the player.
When the ignition or radio is turned on, the CD-R
or CD-RW starts to play where it stopped, if it
was the last selected audio source.
As each new track starts to play, the track number
and song title displays.
If playing a CD-R or CD-RW, the sound quality
can be reduced due to CD-R or CD-RW quality,
the method of recording, the quality of the
music that has been recorded, and the way the
CD-R or CD-RW has been handled. There can
be an increase in skipping, difficulty in finding
tracks, and/or difficulty in loading and ejecting.