Author's note: This needs a lot more work (add graphics?)
What is the marker?
The marker is a cursor that may be moved to set the current position.
A sound player may, for example, use the marker as a place to start playing
a sound.
How to move the marker (assuming it's enabled)?
Click anywhere in the wave form to set the marker's position. You
can also drag the marker to move it.
How does selection work in GtkWaveView?
An application may enable selection on certain channels. It can change
which ones are selected and may provide a user interface to do so. Typically,
there will be a menu or a row of checkboxes to select each channel individually.
Selection method #1:
Drag a selection directly.
Selection method #2:
Drag an end of an existing selection.
Selection method #3:
Set the marker to one endpoint. Move with the scrollbar until you see
where you want the other side of the selection. Then hold down shift
and click where you want the other end of the selection.