Ford 1999 Wagon-Econoline Owner's Manual page 48

Controls and features
To deactivate autoset and return to your audio system's manually set
memory stations, press the AUTO control again.
Bass adjust
The bass adjust control allows you
to increase or decrease the audio
system's bass output.
Press the BASS control then press:
•
to decrease the bass output
and
•
to increase the bass output.
Treble adjust
The treble adjust control allows you
to increase or decrease the audio
system's treble output.
Press the TREB control then press:
•
to decrease the treble output
and
•
to increase the treble output.
Speaker balance adjust
Speaker sound distribution can be
adjusted between the right and left
speakers.
48
BASS TREB
SEL
BASS TREB
SEL
BAL FADE