GMC Envoy Owner's Manual page 216

Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance between the right
and the left speakers, push and release the AUDIO
knob until BAL appears on the display. Turn the knob
to move the sound toward the right or the left speakers.
To adjust the fade between the front and the rear
speakers, push and release the AUDIO knob until FADE
appears on the display. Turn the knob to move the
sound toward the front or the rear speakers.
To adjust the balance and the fade to the middle
position, push the AUDIO knob, then push it again and
hold it until you hear one beep.
To adjust all tone and speaker controls to the middle
position, push and hold the AUDIO knob when no tone
or speaker control is displayed. ALL CENTERED will
appear on the display and you will hear a beep.
Finding a Program Type (PTY)
Station (RDS and XM™)
To select and find a desired PTY perform the following:
1. Press the SEEK TYPE button to activate program
type select mode. TYPE and a PTY will appear on
the display.
2. Turn the P-TYPE knob to select a PTY.
3. Once the desired PTY is displayed, press the
SEEK TYPE button to select and to take you to the
PTY's first station.
4. To go to another station within that PTY and the
PTY is displayed, press the SEEK TYPE button
once. If the PTY is not displayed, press the SEEK
TYPE button twice to display the PTY and then
to go to another station.
5. Press SEEK TYPE button, while seeking, to exit
program type select mode.
IF PTY times out and is no longer on the display,
go back to Step 1.
If both PTY and TRAF are on, the radio will search for
stations with the selected PTY and traffic
announcements.
If the radio cannot find the desired program type, NONE
will appear on the display and the radio will return to
the last station you were listening to.
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