Yamaha A3000 Owner's Manual page 29

<Level>
If either the start point or the end point are changed to a location that is
near the level of the other point (the existing end point or start point),
the newly set point will be moved to a location of a matching level. If both
points are newly set, the end point will be moved to the level of the start
point.
* The start point and end point will always move toward the inside of the
region.
* If two or more channels are selected, the points will be moved according
to the data of the upper channel.
* The range of the adjustment performed by Auto Snap will not exceed five
seconds for either the start point or end point.
* With the default settings, Auto Snap will match the upward/downward level
slope of the start point and end point, but you can make settings in the
"Preferences..." dialog box so that this will be ignored. For details refer to
"8.3.3. Others."
7.5. Hide (or Show) File/Device Info
Toggle the file information display and device information display between
hidden and visible.
7.6. Hide (or Show) Waveform
Toggle the waveform in the waveform display between hidden and visible.
7.7. Hide (or Show) Overview
Toggle the overall waveform display between hidden and visible.
7.8. Time Ruler
Select whether the time axis (horizontal) of the waveform display will be
displayed in the specified units or will be hidden.
<Hide>
Hide the time axis.
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