GMC 2007 Acadia Owner's Manual page 274

Playing a CD(s) (Six-Disc CD Player)
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LOAD : Press this button to load CDs into the
CD player. This CD player holds up to six CDs.
To insert one CD, do the following:
1. Press and release the load button.
2. Wait for the message to insert the disc.
3. Load a CD. Insert the CD partway into the slot,
label side up. The player pulls the CD in.
To insert multiple CDs, do the following:
1. Press and hold the load button for
two seconds. A beep sounds and
Load All Discs displays.
2. Follow the displayed instruction on when to
insert the discs. The CD player takes up to
six CDs.
3. Press the Load button again to cancel
loading more CDs.
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If the ignition or radio is turned off, with a CD
in the player, it stays in the player. When
the ignition or radio is turned on, the CD starts
playing where it stopped, if it was the last selected
audio source.
When a CD is inserted, the CD symbol displays.
As each new track starts to play, the track number
displays.
If playing a CD-R, the sound quality can be
reduced due to CD-R quality, the method of
recording, the quality of the music that has been
recorded, and the way the CD-R has been
handled. There can be an increase in skipping,
difficulty in finding tracks, and/or difficulty in loading
and ejecting. If these problems occur, check
the bottom surface of the CD. If the surface of the
CD is damaged, such as cracked, broken, or
scratched, the CD does not play properly. If the
surface of the CD is soiled, see Care of Your CDs
and DVDs on page 328 for more information.