GMC 2001 Sierra 1500 Pickup Owner's Manual page 216

Remote Cassette Tape Player (If Equipped)
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If you have an AM FM Stereo Audio Compact Disc
Automatic Tone Control System that includes a remote
cassette player, the cassette player is located in the
center of the instrument panel.
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.
To load a cassette tape with the ignition off, first press
EJECT on the remote player. Then, insert the cassette
tape. The tape will play if the ignition is on but the radio
is off.
Once the tape is playing, use the control knobs for VOL,
AUTO TONE, BAL, FADE, BASS and TREB just as
you do for the radio.
A lighted tape symbol shows when a cassette tape is in
the player. A lighted arrow will also appear and show the
direction of play when a tape is active.
The player automatically senses if the cassette tape is
metal or CrO and adjusts for best playback sound.
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Anytime a cassette tape is inserted, the top side is
selected for play first.
PREV (1): Press PREV or the SEEK left arrow
(in the opposite direction that the lighted tape direction
arrow points) to search for the previous selection.
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A minimum three second blank gap is needed for the
player to stop at the beginning of the selection. The tape
direction arrow will blink during the SEEK operation
and the sound is muted in this mode.
NEXT (3): Press NEXT or the SEEK right arrow
(in the direction that the lighted tape direction arrow
points) to search for the next selection. The tape
direction arrow will blink during SEEK operation and
the sound is muted in this mode.
REV (4): Press this button to rapidly reverse the tape.
The tape will rapidly reverse to the beginning of the
cassette reel or until you press REV again. The radio
plays the last selected station during REV.
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