Toyota 2006 4runner Owner's Manual page 210

'06 4Runner_U (L/O 0508)
TUNE·FILE (Tuning and File up/down)
Radio
Turn the knob clockwise to step up the
frequency. Turn the knob counterclockwise
to step down the frequency.
MP3/WMA player
Turn the knob clockwise to file up. Turn
the knob counterclockwise to file down.
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