GMC 2007 Sierra 1500 Pickup Owner's Manual page 328

RDM (Random): With random, you can listen to
the tracks in random, rather than sequential,
order, on one CD or on all of the CDs. To use
random, do one of the following:
•
To play the tracks on the CD you are listening
to in random order, press and release the
RDM button. RANDOM ONE will appear on
the display. Press RDM again to turn off
random play.
•
To play the tracks on all of the CDs that are
loaded in random order, press and hold
RDM for more than two seconds. You will hear
a beep and RANDOM ALL will appear on
the display. Press RDM again to turn off
random play.
AUTO EQ (Automatic Equalization): Press
AUTO EQ to select the equalization setting while
playing a CD. The equalization will be stored
whenever a CD is played. For more information on
AUTO EQ, see "AUTO EQ" listed previously in
this section.
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SEEK : Press the left arrow to go to the
start of the current track, if more than ten seconds
have played. Press the right arrow to go to the
next track. If either arrow is pressed more
than once, the player will continue moving
backward or forward through the CD.
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SCAN : To scan one CD, press and hold
either SCAN arrow for more than two seconds until
TRACK SCAN appears on the display and you
hear a beep. The radio will go to the next
track, play for 10 seconds, then go on to the next
track. Press either SCAN arrow again, to stop
scanning.
To scan all loaded CDs, press and hold either
SCAN arrow for more than four seconds until ALL
CD SCAN appears on the display and you hear
a beep. Use this feature to listen to 10 seconds of
the first track of each loaded CD. Press either
SCAN arrow again, to stop scanning.