Pontiac 2005 G6 Owner's Manual page 175

Setting the Tone (Bass/Midrange/Treble)
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TONE / / (Bass/Treble): Press and release this
button until BASS, MID, or TREB appears on the
display. Turn the ADJ knob to increase or to decrease.
The display will show the bass, mid, or treble level.
If a station is weak or noisy, decrease the treble.
To adjust bass, midrange, or treble to the middle
position, select BASS, MID, or TREB. Then press and
hold the tone button for more than two seconds.
The display level will be adjusted to the middle position
and you will hear a beep.
To adjust all tone controls to the middle position, press
and hold the tone button when no tone control is
displayed. ALL CENTERED will appear on the display
and you will hear a beep.
AUTO TONE/AUTO EQ (Automatic Equalization):
Press this button to select customized equalization
settings designed for country, jazz, talk, pop, rock,
and classical.
The equalization setting last chosen will appear on the
display when you first press this button. Each time
you press this button, another equalization setting will
appear on the display and automatic tone or automatic
equalization will switch to that preset equalization
settings.
To return to the manual mode, press the AUTO TONE
or AUTO EQ button until CUSTOM appears on the
display. Then manually adjust the bass, midrange, and
treble using the tone button.
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