2007 GMC Savana Van Owner's Manual - Page 194

Setting the Tone (Bass/Treble) AUDIO: To adjust the bass or the treble, press and release the AUDIO button until BAS (bass) or TRE (treble) appears on the display. Then press and hold the up or the down arrow to increase or to decrease. If a station is weak or has static, decrease the treble. To adjust bass or treble to the middle position, select BAS or TRE. Then press and hold the AUDIO button for more than two seconds until you hear a beep. B and a zero or T and a zero appears on the display. To adjust both tone controls and both speaker controls to the middle position, first end out of audio mode by pressing another button, causing the radio to perform that function, or by waiting five seconds for the display to return to the time of day. Then press and hold the AUDIO button for more than two seconds until you hear a beep. CEN (center) appears on the display. Adjusting the Speakers (Balance/Fade) AUDIO: To adjust the balance between the right and the left speakers, press and release the AUDIO button until BAL (balance) appears on the display. Then press and hold the up or the down arrow to move the sound toward the right or the left speakers. To adjust the fade between the front and the rear speakers, press and release the AUDIO button until FAD (fade) appears on the display. Then press and hold the up or the down arrow to move the sound toward the front or the rear speakers. The fade feature may not be available on all radio systems. To adjust balance or fade to the middle position, select BAL or FAD. Then press and hold AUDIO for more than two seconds until you hear a beep. B and a zero or F and a zero appears on the display. To adjust both tone controls and both speaker controls to the middle position, first end out of audio mode by pressing another button, causing the radio to perform that function, or by waiting five seconds for the display to return to the time of day. Then press and hold the AUDIO button for more than two seconds until you hear a beep. CEN appears on the display. 194