Chevrolet 2004 Corvette Owner's Manual page 192

Setting the Tone (Bass/Treble)
BASS: To adjust the bass, press this knob lightly so it
extends. Turn the knob to increase or to decrease bass.
TREB (Treble): To adjust the treble, press this knob
lightly so it extends. Turn the knob to increase or
to decrease treble. If a station is weak or noisy, you
may want to decrease the treble.
Return these knobs to their stored positions when you
are not using them.
AUTO TONE (Automatic Tone): Press this button to
select customized equalization settings designed
for country/western, jazz, talk, pop, rock, and classical.
To return the bass and treble to the manual mode,
either press and release the AUTO TONE button until
the display goes blank or press and release the BASS or
TREB knob and turn it until the display goes blank.
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Adjusting the Speakers (Balance/Fade)
BAL (Balance): To adjust the balance between the
right and the left speakers, press this knob lightly so it
extends. Turn the knob to move the sound toward
the right or the left speakers.
FADE: To adjust the fade between the front and the
rear speakers, press this knob lightly so it extends.
Turn the knob to move the sound toward the front or the
rear speakers.
Return these knobs to their stored positions when you
are not using them.