Windows Movie Maker:
editing soundtrack

Right-click on the soundtrack:

you can turn off (mute)
or adjust the volume.

* You can check fade in
or fade out to get a smooth start or finish.

Dividing the soundtrack

1: You can use the magnifying glass
to enlarge the view
of the timeline.

2: Click on the soundtrack.

3: Click on the timeline
where you want to divide
the soundtrack.

4: You can move
forward / backward for
a finer placement.

5: Click on the "crop"
button to divide the
soundtrack.