Radio Shack 120-2130A - Manual (Page 16)

forward through the entire cassette in both directions.
Fast-Forward and Rewind
To rewind or quickly fast-forward the current side, firmly press << or >>
respectively until the button locks and the tape quickly winds. Play
resumes when the end of the tape is reached.
To stop fast winding before the end of the tape, gently press and release
the opposite button. Play continues in the same direction.
Note: Fast-forward always quickly moves the tape in the same direction the
tape is currently playing, and rewind always quickly moves the tape
in the opposite direction the tape is currently playing.
Listening to the Radio During Fast-Forward or Rewind
During fast-forward and rewind you can listen to the radio.
The radio is preset to play while you fast forward or rewind a tape.
However, you can turn off the radio monitor function by pressing F/C,
and turn it back on by pressing F/C again.