GMC 1993 Safari Owner's Manual page 137

How
io
Operate Your E T P AM Radio
K4308
This part tells you how your ETR@ AM radio works.
The Upper Knob
The upper knob does these three things:
It controls the volume.
It lets you see what station you have. (When the radio is on, push the
It tells you the time. (When the ignition is off, push the knob to display
knob to display the station.)
the time.)
The control behind the upper knob moves the sound between the left and
right speakers.
The Lower Knob
Turn the lower knob to choose radio stations.
lone Levers
Two levers control the tone
of your radio.
BASS-Slide this lever up to hear more bass.
TREBLE-Slide this lever up to hear more treble.
Adjust these levers to give a pleasing sound.
If
a station is weak and noisy,
move TREBLE down to reduce the noise.
3-1 1