Chevrolet 2007 Optra Owner's Manual page 188

Setting Preset Stations
Up to 36 stations (six FM1, six FM2, six FM-A,
six AM1, six AM2, and six AM-A), can be
programmed on the six numbered buttons, by
performing the following steps:
1. Turn the radio on.
2. Press the AM or FM button to select FM1,
FM2, FM-A, AM1, AM2, or AM-A.
3. Tune in the desired station.
4. Press and hold one of the six numbered
pushbuttons for more than two seconds.
The channel number (CH#1 through CH#6)
flashes on the display when the station
has been set. Whenever that numbered preset
button is pressed, that preset station returns.
5. Repeat the Steps 1 through 4 for each
preset button.
Order of Sound Function
The order for displayed sound function is BASS,
TRE, FAD, BAL, EQ OFF, and VOL (Bass, Treble,
Fade, Balance, Equalization Off, and Volume).
188
Setting the Tone
(Bass/Midrange/Treble)
SOUND (Bass/Midrange/Treble): Press this
button until BAS (bass) displays. Turn the
power/volume knob to increase or to decrease the
bass. The display shows the bass level. After
making the selection, press this button to select
the bass level.
Press this button until MID (midrange) displays.
Turn the power/volume knob to increase or
to decrease the midrange. The display shows the
midrange level. After making the selection,
press this button to select the midrange level.
Press this button until TRE (treble) displays.
Turn the power/volume knob to increase or to
decrease the treble. The display shows the treble
level. After making the selection, press this
button to select the treble level. If a station is weak
or has static, decrease the treble.