GMC 2003 Safari Owner's Manual page 168

Setting the Tone (Bassnreble)
BASS: Press this knob lightly so it extends. Turn the
knob to increase or to decrease bass.
TREB (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're not using them.
AUTO TONE (Automatic Tone): Press this knob to
choose bass and treble equalization settings designed
for country/western, jazz, talk, pop, rock and classical
stations.
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 knobs and turn them until the display goes blank.
Adjusting the Speakers (Balance/Fade)
BAL (Balance): Press this knob lightly so it extends.
Turn the knob to move the sound toward the right or the
left speakers.
FADE: 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're not using them.
Playing a Compact Disc
Insert a disc partway into the slot, label side up.
The player will pull it in. Wait a few seconds and the
disc should play. CD and a CD symbol will also appear
on the display. Anytime you are playing a CD, the
letters CD will be next to the CD symbol.
If an error appears on the display, see "Compact Disc
Messages" later in this section.
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