Chevrolet 2007 TrailBlazer Owner's Manua page 263

Setting Preset Stations
Up to 30 stations (six FM1, six FM2, and six AM,
six XM1 and six XM2 (if equipped)), can be
programed on the six numbered pushbuttons,
by performing the following steps:
1. Turn the radio on.
2. Press BAND to select FM1, FM2, AM,
or XM1 or XM2.
3. Tune in the desired station.
4. Press and hold one of the six numbered
pushbuttons until a beep sounds. Whenever
that numbered pushbutton is pressed,
the station that was set, returns.
5. Repeat the steps for each pushbutton.
To store an equalization setting to a preset station
perform the following:
1. Tune to the preset station.
2. Press and release the AUTO EQ button to
select the equalization setting.
Once the equalization no longer displays,
the equalization is set for that preset station.
Setting the Tone
(Bass/Midrange/Treble)
AUDIO: Push and release the AUDIO knob until
BASS, MID (midrange) (without Bose
(treble) displays. Turn the knob to increase or to
decrease the tone. The display shows the bass,
midrange (without Bose
station is weak or has static, decrease the treble.
To adjust the bass, midrange (without Bose
treble to the middle position while it is displayed,
push and hold the AUDIO knob. The radio produces
one beep and adjusts the display level 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 controls displays.
ALL CENTERED displays and a beep sounds.
AUTO EQ (Automatic Equalization): Press this
button to select customized equalization settings
designed for country/western, jazz, talk, pop,
rock, and classical.
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