1998 GMC Sonoma Owner's Manual - Page 147

AUTO TONE: Press this button to select among the six preset equalization settingsand tailor the sound to the music or voice being heard. Each time you press the button, the selection will switch to one of the preset settings of CLASSIC, NEWS, ROCK, POP, CnV (Country/Western) or JAZZ. To return to the manual mode, press and release this button until the AUTO TONE display goes blank. This will return the tone adjustment to the BASS and TREB controls. If a BASS or TREB control is rotated, the AUTO TONE display will go blank. Use PUSHBUTTONS to program AUTO TONE. Adjusting the Speakers Playing a Compact Disc PWR: Press this knob to turn the system on. (Please note that you can also turn the system on when you insert a compact disc intothe player with the ignition on.) Insert a disc partway into the slot, label side up. The player will pull it in. Wait a few seconds and the disc should play. CD and a CD symbol will also appear on the display. Anytime you are playing a CD, the letters CD will be next to the CD symbol. If the disc comes back out and ERR appears on the display, it could be that: You are driving on a very rough road. (The disc should play when the road gets smoother.) The disc is upside down. It is dirty, scratched or wet. 0 BAL: Press lightly on this knob to release it from its stored position. Turn the control to the right to adjust sound to the right speakers and to the left to adjust sound to the left speakers. The middle position balances the sound between the speakers. It is very humid. (If so, wait about an hour and FADE: Press lightly on this knob to release it from its stored position. Turn the control to the right to adjust the sound to the front speakers and to the left for the rear speakers. The middle position balances the sound between the speakers. Push these knobs back into their stored positions when you're not using them. try again.) 0 The disc player is very hot. Press RECALLto make ERR go off the display. PREV (1): Press PREV or the SEEK left arrow to search for the previous selection. If you hold this button or press it more than once, the disc will advance further. Sound is muted in this mode. 3-17