Yamaha A3000 Owner's Manual page 11

This numerically indicates the loop region. The start, end, and length of
the loop region are displayed as a number of samples (Sample) and as hours/
minutes/seconds/milliseconds (Time).
If you specify a loop range and turn on the Loop button, the loop region
will continue to repeat during playback.
*The loop range settings have no effect during recording or during Play
Selection (playback of the selected region).
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 set the loop range by holding down the Option key and dragging
over the time axis (Time Ruler) located above the waveform display.
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 loop region.
If the loop region lock button has been pressed, it will not be possible to
modify the various loop region values.
If the loop length lock button has been pressed, changing either the loop
start point or loop end point will automatically modify the other point so
as to preserve the length of the loop region.
4.6. Display resolution (Zoom)
This indicates the resolution of the time axis (horizontal) and amplitude
axis (vertical) at which the waveform is displayed in the waveform display
area.
To change the resolution of the time axis, drag the slider knob to left or
right, or click the +/- buttons located at each end. To change the
resolution of the amplitude axis, press the mouse button on the numerals and
then select a value from the popup menu that appears, or click the +/-
buttons located at each end.
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