Try This
Increase a clip’s audio level over time using keyframes:
1With Audio Clip 1 open in the Audio tab of the Viewer, drag the fader sliders in the Audio Mixer all the way to the bottom to set the audio level at the lowest level possible.
2Press Home to position the playhead at the beginning of the clip.
3Click the Level Keyframe button in the Viewer to add an audio level keyframe to the first frame of the clip.
Level Keyframe button
4Position the playhead in the Viewer where you want the audio to reach the maximum level, similar to the playhead position shown below.
Position the playhead here.
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Chapter 6 Working with Audio
