Chevrolet Aveo 2007 Owner's Manual page 192

Setting the Tone
(Bass/Midrange/Treble)
SOUND (Bass/Midrange/Treble): Press this
button until BAS appears on the display. Turn the
power/volume knob to increase or to decrease the
bass. The display will show the bass level. When
finished making the selection, press this button to
select the bass level.
Press this button until MID appears on the display.
Turn the power/volume knob to increase or to
decrease the midrange. The display will show
the midrange level. When finished making the
selection, press this button to select the midrange
level.
Press this button until TRE appears on the display.
Turn the power/volume knob to increase or to
decrease the treble. The display will show the treble
level. When finished making the selection, press
this button to select the treble level. If a station is
weak or there is static, decrease the treble.
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Adjusting the Speakers (Balance/Fade)
SOUND (Balance/Fade): To adjust the balance
between the right and the left speakers, press this
button until BAL appears on the display. Turn the
power/volume knob to increase or to decrease. The
display will show the balance level. When finished
making the selection, press this button to select the
balance level.
To adjust the fade between the front and the rear
speakers, press this button until FAD appears
on the display. Turn the power/volume knob to
increase or to decrease the fade between the front
and the rear speakers. The display will show the
fade level. When finished making the selection,
press this button to select the fade level.