iMovie iMovie has several audio effects you can apply to the sound in your projects. For example, you can give audio a muffled sound, make it sound as though it were recorded in a cathedral or a small room, and so on.
You can apply audio effects to any audio in your project, including the audio recorded with video, sound effects, music you add to video clips, voiceovers, background music, and so on.
If you want to add a sound effect—such as an animal noise, a boom, or a honk—to your project, go to this topic instead: Add a sound clip to your project.
To apply an audio effect to a clip:
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In the Project browser, double-click a video clip or an audio clip (the colored bar that represents a voiceover, a sound effect, or music you’ve added to a clip, shown below) you want to add an effect to.
If you choose a video clip, the audio effect you apply modifies the sound that was recorded with the video, not other sound you’ve added to the video clip.
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Click the Audio Effect button in the inspector that opens.
Unless the clip already has an effect applied to it, the button is labeled None.
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In the window that opens, move your pointer over any effect to hear it; leave the pointer in place to preview the effect in a loop.
Press the Space bar to stop the preview.
Click an effect to apply it to the clip, and then click Done.
To remove an audio effect from a clip:
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In the Project browser, double-click a video clip or an audio clip (the colored bar that represents a voiceover, a sound effect, or music you’ve added to a clip, shown below) whose audio effect you want to remove.
Click the Audio Effect button in the inspector that opens.
In the window that opens, click None, and then click Done.