Yamaha RX21 Owner's Manual page 16

Press STEP WRITE to enter the step write mode.
POUN?
NOTE:
Each time you move through the bar using the —1/NO or +1/YES keys, you'll
hear whatever has been programmed
into each beat. It's rather like moving
through a video or movie frame by frame. Also, you can hold down а -1/NO
or +1/YES kev and move rapidly through the bar, which will speed up your
step write ability tremendously, once you learn to release the —1/МО ог +1/YES
key on the right beat.
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