GMC 2008 Envoy Denali Owner's Manual page 210

For vehicles that have a radio with a Six-Disc CD
player, see the following:
LOAD: Press to load CDs into the CD player. This CD
player holds up to six CDs.
To insert one CD, do the following:
1. Turn the ignition on.
2. Press and release the LOAD button.
3. Wait for the indicator light, located to the right of the
slot, to turn green.
4. Load a CD. Insert the CD part way into the slot,
label side up. The player pulls the CD in.
To insert multiple CDs, do the following:
1. Turn the ignition on.
2. Press and hold the LOAD button for two seconds.
A beep sounds and the indicator light, located to
the right of the slot, begins to flash and MULTI
LOAD # displays.
3. Once the light stops flashing and turns green,
INSERT CD # displays, load a CD. Insert the CD part
way into the slot, label side up. The player pulls the
CD in.
Once the CD is loaded, the indicator light begins
flashing again. Once the light stops flashing and
turns green, you can load another CD. The CD player
takes up to six CDs. Do not try to load more than six.
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To load more than one CD but less than six, complete
Steps 1 through 3. When finished loading CDs,
press the LOAD button to cancel the loading function.
The radio begins to play the last CD loaded.
If more than one CD has been loaded, a number for
each CD displays.
Playing a Specific Loaded CD
For every CD loaded, a number displays. To play a
specific CD, first press the CD AUX button (if not already
in CD mode), then press the numbered pushbutton
that corresponds to the CD. A small bar displays under
the CD number that is playing and the track number
displays.
Z
(Eject) (Base or MP3 Radio): Press to eject a
CD. Eject can be activated with either the ignition
or radio off. CDs can be loaded with the radio and
ignition off if this button is pressed first.
CD Z (Eject): Press to eject CD(s).
To eject the CD that is currently playing, press and
release this button.