1994 Buick Skylark Owner's Manual - Page 134

To Play This Radio The Upper Knob The upper knob does these things: It turns the radio on. It controls the volume. It tells you the time. (When the ignition is off, push the RCL knob to display the time.) It allows you to hear the other side of a tape. (Press PROG-RCL knob while a cassette playing,) is to The pushbuttons let you return favorite stations. You can set the pushbuttons for up to fourteen stations (7 AM and 7 FM). ~ 132