Oldsmobile 1999 Alero - Manual (Page 137)

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Setting the Tone
BASS: Press this knob lightly so it extends. Turn the
knob to increase or decrease bass.
TREB: Press this knob lightly so it extends. Then pull
the knob all the way out. Turn it to increase or decrease
treble. If a station is weak or noisy, you may want to
decrease the treble.
Push the knob back into its stored position when you’re
not using it.
Adjusting the Speakers
BAL: Press this knob lightly so it extends. Turn the
knob to move the sound to the left or right speakers.
The middle position balances the sound between
the speakers.
FADE: Press the knob lightly so it extends. Then pull
the knob all the way out. Turn it to move the sound to
the front or rear speakers. The middle position balances
the sound between the speakers.
Push the knob back into its stored position when you’re
not using it.
AM-FM Stereo with Cassette Tape Player
and Automatic Tone Control (If Equipped)