GMC 2007 Acadia Owner's Manual page 298

When play enters a new folder, the display does
not automatically show the new folder name unless
you have chosen the folder mode as the default
display. The new track name displays.
File System and Naming
The song name that displays 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 does not display.
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.
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Playing an MP3/WMA
Insert a CD-R or CD-RW partway into the slot
(Single CD Player), or press the load button and
wait for the message to insert disc (Six-Disc
CD Player), label side up. The player pulls it in,
and the CD-R or CD-RW should begin playing.
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.