2002 GMC Sonoma Owner's Manual - Page 169

Setting the Tone (Bass/Treble) BASS: Slide this lever up or down to increase or decrease bass. TREB (Treble): Slide this lever up or down to increase or decrease treble. If a station is weak or noisy, you may want to decrease the treble. Adjusting the Speakers (Balance/Fade) BAL (Balance): Turn the control ring behind the upper knob to move the sound to the left or right speakers. The middle position balances the sound between the speakers. FADE: Turn the control ring behind the lower knob to move the sound to the front or rear speakers. The middle position balances the sound between the speakers. Playing a Cassette Tape Your tape player is built to work best with tapes that are up to 30 to 45 minutes long on each side. Tapes longer than that are so thin they may not work well in this player. Once the tape is playing, use the VOLUME, BAL, FADE, BASS and TREB controls just as you do for the radio. If an error appears on the display, see "Cassette Tape Messages" later in this section. REV (Reverse): Press this button to reverse the cassette tape. Press the FWD button to stop reversing the tape. FWD (Forward): Press this button to advance the cassette tape. Press the REV button to stop forwarding the tape. RECALL: Press this knob to switch tape sides. EJECT: Press this button to stop a tape when it is playing or to eject a tape when it is not playing. Cassette Tape Messages CLN (Clean): If this message appears on the display, the cassette tape player needs to be cleaned. It will still play tapes, but you should clean it as soon as possible to prevent damage to the tapes and player. See "Care of Your Cassette Tape Player" in the Index. 3-15