Yamaha A3000 Owner's Manual page 10

If you click on the time axis markings (Time Ruler) of the waveform display
area, the location at which you clicked will be specified as the playback
start location.
While sound data is being played back or recorded, the current location is
displayed in realtime.
4.4. Selected region display (Selection)
This numerically indicates the region that has been selected in the waveform
display. The start, end, and length of the region are displayed as a number
of samples (Sample) and as hours/minutes/seconds/milliseconds (Time).
You can click on one of these values and type in the numerical value from
the keyboard of your computer. Numerical values can be input either for
Sample or Time fields. Changing one will cause the other to be calculated
and set automatically.
You can also specify the selected region by dragging to left or right in the
waveform display area.
During playback, you can press the start point setting button [|<] / end
point setting button [>|] to set the currently-playing location as the start
or end point of the selected region.
If the region lock button is pressed, these values cannot be changed.
If the region length lock button is pressed, modifying either the start or
the end of the selected region will cause the other point to be shifted so
as to maintain the length of the region.
4.5. Loop region display (Loop)
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