Sony WALKMAN PROFESSIONAL WM-D6C Operating Instructions Manual page 7

SPEED TUNE SELECTOR AND CONTROL
The playback speed can be adjusted to tune
the pitch of a tape, recorded on another tape
recorder. Set the SPEED TUNE selector to ON
and turn the SPEED TUNE cofftrol to F (fast)
or S (slow). For normal tape speed, set it to
OFF.
When the @ RECORD button is pressed, this
selector is automatically set to the OFF posi-
tion.
TO DUPLICATE ONTO ANOTHER TAPE
RECORDER
Use the supplied connecting cord, or an optional
RK-G129HG or RK-G136HG connecting cord.
another tape
WM-D6C recorder
. RK-G129HG = © R
LINE OUT um © r
RK-G136HG
LINE IN