GMC Envoy Owner's Manual page 245

Setting the Tone (Bass/Treble)
AUDIO: Push and release the AUDIO knob until BASS,
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MID (without Bose ), or TREB appears on the display.
Turn the knob to increase or to decrease. The
display will show the bass, midrange (without Bose
or treble level. If a station is weak or noisy, decrease
the treble.
To adjust the bass, midrange (without Bose
treble 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 controls are displayed. ALL CENTERED
will appear on the display and you will hear a beep.
AUTO EQ (Automatic Equalization): Press this button
to select customized equalization settings designed
for country/western, jazz, talk, pop, rock, and classical.
The radio will save separate AUTO EQ settings for
each preset and source.
If the radio is equipped with the Bose
the equalization settings are either CUSTOM or TALK.
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Adjusting the Speakers (Balance/Fade)
AUDIO: To adjust the balance between the right
and the left speakers, push and release the AUDIO
knob until BAL appears on the display. Turn the knob to
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), move the sound toward the right or the left speakers.
To adjust the fade between the front and rear speakers,
push and release the AUDIO knob until FAD appears
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), and 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 controls are displayed. ALL CENTERED
will appear on the display and you will hear a beep.
®
audio system,