You can adjust the volume over time of your script or audio layers with volume keyframes:
- Right click on your script track or select an audio layer in the Script Editor; you’ll also want to expand the Timeline by vertically dragging to the edge of the timeline panel.
- Select Add volume keyframe. You will need to add at least two to increase/decrease volume over time
Alternatively, you add volume keyframes by holding option (macOS) or alt (Windows) and clicking on your script track or audio layer in the Timeline.
- You can then drag the keyframe in your Timeline to adjust the volume of your audio and the keyframe's position.