Adjusting clip volume
There are different ways to control clip volume. Clip volume represents the percentage of the original recorded volume. Values range from 0 to 500%, where 0% completely silences the clip and 100% retains the original recorded volume.
To adjust the volume of a video or audio clip1 In the Timeline, select an audio clip (or video with sound).
2 Do one of the following:
• Right-click the clip, choose Adjust Volume from the context menu, and enter a new value in the volume box.
• Click the Sound Mixer button 
on the Timeline toolbar, and in the Options panel, adjust the volume slider.
on the Timeline toolbar, and in the Options panel, adjust the volume slider.