GMC 2003 Savana Van Owner's Manual page 183

Setting the Tone (Bassnreble)
AUDIO: Press and release the AUDIO knob until
BASS, MID, or TREB appears on the display. Turn the
knob to increase or to decrease. The display will
show the bass, midrange, or treble level. If a station is
weak or noisy, you may want to decrease the treble.
To adjust the bass, midrange, and treble to the middle
position, push the AUDIO knob. The radio will
produce one beep and adjust 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 control is displayed. The radio will produce
one beep and display CENTERED.
AUTO EQ (Automatic Equalization): Press this button
to choose bass and treble equalization settings
designed for country/western, jazz, talk, pop, rock and
classical stations.
Adjusting the Speakers (BalanceIFade)
AUDIO: To adjust the balance to the right and the
left speakers, push and release the AUDIO knob until
BAL appears on the display. Turn the knob to move the
sound toward the right or the left speakers.
To adjust the fade to the front and the rear speakers,
push and release the AUDIO knob until FADE appears
on the display. Turn the knob to move the sound
toward the front or the rear speakers.
To adjust the balance and fade to the middle position,
push and hold the AUDIO knob. The radio will produce
one beep and adjust 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 control is displayed. The radio will produce
one beep and display CENTERED.
To return the bass and treble to the custom mode,
press and release the AUDIO knob, until CUSTOM
appears.
3-62