1994 GMC Sonoma Owner's Manual - Page 131

How to Operare Your ETW AM-FM Stereo Audio Compact Disc(CD) System This part tells you how your ETR' AM-FM stereo system works: Upper Knob (PWR-VOL) The upper knob has three functions: 0 It switches the radio on and off when the ignition is on. It controls the volume. Volume will increase when the RCL knob is turned to the right and decrease when turned to the left. Volume will be displayed briefly unless Left/Right speaker control, Rear/Front speaker control, BASS or TREB are adjusted. It controls the mute feature. By pressing the MUTE knob, all sound from the radio or CD player stops. By pressing the knob again, or by turning the VOL knob to the right, sound will begin again. 0 0 Left/Right Speaker Control The control ring behind the upper knob allows you to balance the sound between the left and right speakers. Balance will be displayed briefly when using this control. Lower Knob The lower knob has two functions: It enables you to tune in different radio stations by turning the knob to the right or to the left. 0 It enables you to alternate between AM and FM stations by pressing the BAND knob. Your selection will be briefly displayed. Rearmront Speaker Control The control ring behind the lower knob fades the sound between your rear and front speakers. Fade levels will be briefly displayed. 3-17