1994 GMC Sonoma Owner's Manual - Page 127

How to Operate Your ETW AM-FM Stereo Audio Cassette System with Equalizer This part tells you how your ETR@AM-FM stereo audio cassette system with equalizer works: Upper Knob (PWR-VOL-PROG-RCL) The upper knob has these five functions: 0 Rotate it to turn the system on and off Rotate it to control the volume. Press it to display the time when the ignition is off (RCL ). Press it to change between the clock and the radio station frequency displayed when the radio is on (RCL ). Press it to change sides of a tape when a cassette is playing (PROG ). BAL (Balance) The control ring behind the upper knob adjusts the lefthight speaker balance. Lower Knob The lower knob has two functions: 0 Rotate it to tune in radio stations. Press it to change between the AM and FM bands. 0 FADE The control ring behind the lower knob adjusts the fronthear speaker balance. SEEK Press the SEEK button to cause the receiver to SEEK the next higher station and stop. 3-13