After clicking the add button, click anywhere on the screen to
create a sound object, or click & drag to draw a sound zone.
Click & drag anywhere on the screen to rotate the
view; right-click & drag to pan; scroll to zoom.
When Altitude View is active, you can change the
height of a sound object or a trajectory point.
Use W, A, S, D keys to move the head inside the scene.
You can also click & drag to move it with your mouse.