Pontiac 2001 Aztek Owner's Manual page 236

Setting the Tone
BASS: Press the AUDIO knob until BASS appears on
the display. Turn the knob to increase or decrease bass.
When you use this control, the radio's tone setting will
switch to custom.
To set the bass to the middle position, select BASS and
press and hold the AUDIO knob. The radio will produce
one beep and set the display level to zero. To set all tone
and speaker controls to the middle position, press and
hold the AUDIO knob when no tone or speaker control
is active. The radio will produce one beep and
CENTERED will appear on the display.
MID: Press the AUDIO knob until MID appears on
the display. Turn the knob to increase or decrease mid.
When you use this control, the radio's tone setting will
switch to custom.
To set the mid to the middle position, select MID and
press and hold the AUDIO knob. The radio will produce
one beep and set the display level to zero. To set all tone
and speaker controls to the middle position, press and
hold the AUDIO knob when no tone or speaker control
is active. The radio will produce one beep and
CENTERED will appear on the display.
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TREB: Press the AUDIO button until TREB appears on
the display. Turn the knob to increase or decrease treble.
When you use this control, the radio's tone setting will
switch to custom. If a station is weak or noisy, you may
want to decrease the treble.
To set treble to the middle position, select TREB and
press and hold the AUDIO knob. The radio will produce
one beep and set the display level to zero. To set all tone
and speaker controls to the middle position, press and
hold the AUDIO knob when no tone or speaker control
is active. The radio will produce one beep and
CENTERED will appear on the display.
AUTO EQ: This feature allows you to choose preset
bass, mid and treble equalization settings designed for
country, jazz, talk, pop, rock and classical stations.
The last setting will appear on the display when you
first press AUTO EQ. Each time you press AUTO EQ,
another setting will appear on the display. Press AUTO
EQ again after TALK appears and CUSTOM will
appear. Tone control will return to the BASS, MID and
TREB. Also, if you alter BASS, MID, or TREB while in
and auto EQ setting, the radio will return to CUSTOM.
CUSTOM will appear on the display.