GMC Sierra Classic 2007 Owner's Manual page 323

AUTO EQ (Automatic Equalization): Press
AUTO EQ to select the equalization setting while
playing a CD. The equalization is 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 continues 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 goes to the next track,
plays for 10 seconds, then goes 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.
INFO (Information): Press this knob to see how
long the current track has been playing. To change
the default on the display, track or elapsed time,
press the knob until you see the desired display,
then press and hold the knob until you hear a beep.
The selected display is now the default.
BAND: Press this button to listen to the radio
when a CD is playing. The inactive CD(s) remains
safely inside the radio for future listening.
CD AUX (Auxiliary): Press this button to play a
CD when listening to the radio. Inactive CD(s)
remains safely inside the radio for future listening.
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