GMC Sierra 2008 Owner's Manual page 286

Z CD (Eject): Press and release this button to eject
the CD-R or CD-RW that is currently playing in the bottom
slot. A beep sounds and Ejecting Disc displays. Once the
disc is ejected, Remove Disc displays. The CD-R or
CD-RW can be removed. If the CD-R or CD-RW is not
removed, after several seconds, the CD-R or CD-RW
automatically pulls back into the player.
If loading and reading of a CD cannot be completed, such
as unknown format, etc., and the disc fails to eject, press
and hold this button for more than five seconds to force
the disc to eject.
Z
DVD (Eject): Press and release this button to eject
the CD-R or CD-RW that is currently playing in the top
slot. A beep sounds and Ejecting Disc displays. Once
the disc is ejected, Remove Disc displays. The CD-R or
CD-RW can be removed. If the CD-R or CD-RW is not
removed, after several seconds, the CD-R automatically
pulls back into the player. If loading and reading of a CD
cannot be completed, such as unknown format, etc., and
the disc fails to eject, press and hold this button for more
than five seconds to force the disc to eject.
f
(Tune): Turn this knob to select MP3/WMA files on
the CD-R or CD-RW that is currently playing.
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SEEK : Press the left SEEK arrow to go to
the start of the current MP3/WMA file, if more than
five seconds have played. If less than five seconds have
played, the previous MP3/WMA file plays. Press the right
SEEK arrow to go to the next MP3/WMA file. If either
SEEK arrow is held, or pressed multiple times, the player
continues moving backward or forward through the
MP3/WMA files on the CD.
S c
(Previous Folder): Press the pushbutton
positioned under the Folder label to go to the first track
in the previous folder.
c T
(Next Folder): Press the pushbutton positioned
under the Folder label to go to the first track in the
next folder.
s REV (Reverse): Press and hold this button to
reverse playback quickly within an MP3/WMA file.
Sound is heard at a reduced volume. Release this
button to resume playing the file. The elapsed time
of the file displays.
\ FWD (Fast Forward): Press and hold this button
to advance playback quickly within an MP3/WMA
file. Sound is heard at a reduced volume. Release this
button to resume playing the file. The elapsed time
of the file displays.