GMC Sierra Classic 2007 Owner's Manual page 304

AUTO EQ (Automatic Equalization): Press this
button to select customized equalization settings
designed for country/western, jazz, talk, pop, rock,
and classical. Selecting CUSTOM or changing
bass or treble, returns the EQ to the manual bass
and treble settings.
The radio saves separate AUTO EQ settings for
each preset and source.
If the radio is equipped with the Bose
system, the equalization settings are either
CUSTOM or TALK.
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 (balance) 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.
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To adjust the balance or fade to the middle position
while it is displayed, push the AUDIO knob, then
push it again and hold it until the radio produces
one beep. The balance or fade adjusts to the
middle position.
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 appears on the display, you will hear a
®
audio
beep, and the display level adjusts to the middle
position.
Finding a Program Type (PTY) Station
(RDS and XM™)
To select and find a desired PTY perform the
following:
1. Press the TYPE button to activate program
2. Turn the TYPE knob or press and release the
type select mode. TYPE and a PTY appears
on the display.
TYPE button to select a PTY.