2002 GMC Envoy Owner's Manual - Page 190

To set treble to the middle position, press and hold P-TYPE LIST AUDIO control. The radio will produce one beep and set the display level to the middle position. To set all tone and speaker controls to the middle position, press and hold the P-TYPE LIST AUDIO control when no tone or speaker control is active. The radio will produce one beep and display ALL with the level display in the middle position. When you use this control, the radio's AUTO TONE setting will return to manual. AUTO TONE: This feature allows you to choose preset bass and treble equalization settings designed for rock, news, pop, jazz, classical and country stations. Each time you press the AUTO TONE button, this feature will change to one of the preset equalization settings previously listed. To return the bass and treble to the manual mode, press and release the P-TYPE LIST AUDIO control. See "Setting Preset Stations" listed previously to program the auto tone feature. Adjusting the Speakers (Balance/Fade) To adjust the balance, press and release the P-TYPE LIST AUDIO control until BAL appears on the display. Turn the control clockwise to move the sound to the right speakers and counterclockwise to move the sound to the left speakers. The middle position balances the sound between the speakers. To set the balance to the middle position, press the P-TYPE LIST AUDIO control briefly, then press it again and hold it until the radio emits one beep. The balance will be set to the middle position and the display will show the speaker balance. To set all tone and speaker controls to the middle position, press and hold the P-TYPE LIST AUDIO control when no tone or speaker control is active. The radio will produce one beep and display ALL with the level display in the middle position. To adjust the fade, press and release the P-TYPE LIST AUDIO control until FADE appears on the display. Turn the control clockwise to move the sound to the front speakers and counterclockwise to move the sound to the rear speakers. 3-16