Chevrolet Kodiak 2006 Owner's Manual page 174

Setting Preset Stations
Up to 18 stations (six FM1, six FM2, and six AM) can be
programmed on the six numbered pushbuttons, by
performing the following steps:
1. Turn the radio on.
2. Press AM FM to select FM1, FM2, or AM.
3. Tune in the desired station.
4. Press and hold one of the six numbered
pushbuttons until you hear a beep. Whenever that
numbered pushbutton is pressed, the station
that was set will return.
5. Repeat the steps for each pushbutton.
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Setting the Tone (Bass/Treble)
AUDIO: To adjust bass and treble, press and release
AUDIO until BAS or TRE appears on the display.
Then press and hold the up or the down arrow to
increase or to decrease. If a station is weak or noisy,
decrease the treble.
To adjust bass or treble to the middle position, select
BAS or TRE. Then press and hold AUDIO for more than
two seconds until you hear a beep. B and a zero or
T and a zero will appear on the display.
To adjust both tone controls and both speaker controls
to the middle position, end out of audio by waiting
for the display to change to the clock display. Then
press and hold AUDIO for more than two seconds until
you hear a beep. CEN will appear on the display.