2007 Chevrolet Colorado Owner's Manual - Page 209

Setting the Tone (Bass/Treble) AUDIO: To adjust bass or treble, press and release AUDIO until BAS (bass) or TRE (treble) displays. Then press and hold the up or the down arrow to increase or to decrease the tone. If a station is weak or has static, decrease the treble. To adjust bass or treble to the middle position, select BAS (bass) or TRE (treble). Then press and hold AUDIO for more than two seconds until a beep sounds. B (balance) and a zero or T (treble) and a zero displays. To adjust both tone controls and both speaker controls to the middle position, first exit out of audio mode by pressing another button, causing the radio to perform that function or wait five seconds for the display to return to time of day. Then press and hold AUDIO for more than two seconds until a beep sounds. CEN (center) displays. Adjusting the Speakers (Balance/Fade) AUDIO: To adjust the balance between the right and the left speakers, press and release AUDIO until BAL (balance) displays. 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 AUDIO until FAD (fade) displays. Then press and hold the up or the down arrow to move the sound toward the front or the rear speakers. To adjust balance or fade to the middle position, select BAL or FAD. Then press and hold AUDIO for more than two seconds until a beep sounds. B (balance) and a zero or F (fade) and a zero displays. To adjust both tone controls and both speaker controls to the middle position, first exit out of audio mode by pressing another button, causing the radio to perform that function or wait five seconds for the display to return to time of day. Then press and hold AUDIO for more than two seconds until a beep sounds. CEN (center) displays. Fade might not be available if the vehicle is a regular cab model. 209