You can apply crossfades for audio transitions between clips. An audio fade is analogous to a video transition. For a crossfade, you add an audio transition between two adjacent audio clips on the same track. To fade in or fade out, you add a crossfade transition to either end of a single clip. Premiere Pro includes three types of crossfade: Constant Gain, Constant Power, and Exponential Fade.
Make sure that the audio track is expanded in a Timeline panel. If necessary, click the triangle to the left of the track name to expand the audio tracks that you want to crossfade.
Do any of the following:
To fade in a clip’s audio, drag an audio transition from the Effects panel to a Timeline panel so that it snaps to the In point of the audio clip. You can also select the applied transition in a Timeline panel. Then, in the Effect Controls panel choose Start At Cut from the Alignment menu.
To fade out a clip’s audio, drag an audio transition from the Effects panel to a Timeline panel so that it snaps to the Out point of the audio clip. You can also select the applied transition in a Timeline. Then, in the Effect Controls panel, choose End At Cut from the Alignment menu.
Use any of the three types of audio crossfade transitions to fade in or fade out.
Do any of the following:
To edit an audio transition, double-click the transition in a Timeline panel and adjust the transition in the Effect Controls panel.
To customize the rate of an audio fade or crossfade, adjust the clip’s audio volume keyframe graph instead of applying a transition.