Ford Windstar Owner's Manual page 75

Increasing or decreasing treble response
Push the "AUDIO" button repeatedly until the display reads
"TREB." Push the right (+) side of the "VOLUME" button to
increase the treble (more "highs"), and push the left ( ) side
to decrease treble (less "highs").
Speaker features and operation
Adjusting speaker balance
Balance control allows you to adjust the sound distribution
between the right and left speakers. Push the "AUDIO"
button repeatedly until the display reads "BAL." Push the
right (+) side of the "VOLUME" button to shift the sound to
the right speakers, and push the left ( ) side to shift the
sound to the left speakers.
Adjusting speaker fader
Fade control allows you to adjust the sound distribution
between the front and rear speakers. Push the "AUDIO"
button repeatedly until the display reads "FADE." Push the
right (+) side of the "VOLUME" button to shift the sound to
the front speakers, and push the left ( ) side to shift the
sound to the rear speakers.
NOTE: Illuminated bars in the display show relative levels of
bass and treble and positions of speaker balance and
fader functions for five seconds after adjustments are
made, then revert to volume level set.
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