Yamaha AW2816 Owner's Manual page 203

If you perform the stereo track record operation
on the MTC slave/word clock slave AW2816, the
stereo output channels of both the word clock
master and slave units will be mixed, and
recorded on the stereo track.
When you perform recording operations on the stereo
track of the MTC slave, press only the REC [ ] key.
(Do not hold down the REC [ ] key and press the
PLAY [ ] key.)
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Operation section