2002 GMC Envoy Owner's Manual - Page 198

Setting the Tone (Bass/Treble) P-TYPE LIST AUDIO: To adjust the bass, press and release the P-TYPE LIST AUDIO control until BASS appears on the display. Then turn the control clockwise to increase bass and counterclockwise to decrease bass. The display will show the bass level. To set the bass to the middle position, press and hold the 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. To adjust the treble, press and release the P-TYPE LIST AUDIO control until TREB appears on the display. Turn the control clockwise to increase treble and counterclockwise to decrease treble. The display will show the treble level. If a station is weak or noisy, you may want to decrease the treble. 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. If your vehicle has the Bose radio, your audio system allows you to choose from four different equalization settings: talk, driver, normal and spatial. These settings can be used while listening to the radio, the cassette tape or CD player. 3-24