Chevrolet 2009 Uplander Owner's Manual page 240

Setting the Tone (Bass/Treble)
O
e
/ (Bass/Treble): Press to select BASS or
TREBLE. Turn to increase or to decrease. If a station is
weak or has static, decrease the treble.
To adjust the bass and treble to the middle position,
press and hold when the tone control is on the display.
The level changes to the middle position.
To adjust all tone and speaker controls to the middle
position, press and hold when no tone or speaker control
displays. AUDIO SETTINGS CENTERED displays.
AUTO EQ (Automatic Equalization): Press to select
customized equalization settings designed for country,
custom, classical, pop, rock, jazz, and talk. 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.
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Adjusting the Speakers (Balance/Fade)
O
e
/ (Balance/Fade): To adjust the balance
between the right and the left speakers, press until
BALANCE displays. Turn to move the sound toward the
right or the left speakers.
To adjust the fade between the front and the rear
speakers, press until FADE displays. Turn to move the
sound toward the front or the rear speakers.
To adjust the balance and fade to the middle position,
press and hold when the speaker control displays.
The level changes to the middle position.
To adjust all tone and speaker controls to the middle
position, press and hold when no tone or speaker control
displays. AUDIO SETTINGS CENTERED displays.