HINT:
the button for less than 2 seconds (quick
a mark, it will move to the marked point.
a long press.
more than 2 seconds you can move to a
desired point.
STOP
Holding the key for more than one second,
operate wind-forward and rewind
Just press the button, and move back or
forward to the file
the button moves to the marking place.
NOTE:
After setting up A and B
you cannot make any settings
you can cancel all settings.