Correct and enhance audio in iMovie on Mac
iMovie has a number of tools you can use to enhance the audio in your movie. You can boost the volume level of quiet audio in a clip, apply an equalizer preset, and reduce background noise.
Automatically enhance audio
In the iMovie app
on your Mac, select one or more audio clips (or video clips with audio) in the timeline.To show the volume controls, click the Volume button.
Click the Auto button.
The average volume of the audio in the selection is boosted, and the Auto button becomes highlighted to indicate that automatic enhancements have been applied.
Reduce background noise
You can automatically reduce background noise in a clip without reducing its overall volume. For example, if you recorded a birthday party and a plane flew overhead, you can reduce the volume of the plane to make your movie sound better.
In the iMovie app
on your Mac, select one or more audio clips (or video clips with audio) in the timeline.To show the noise reduction controls, click the Noise Reduction and Equalizer button.
Select the “Reduce background noise” checkbox.
Drag the slider right to increase the amount of background noise reduction, or left to decrease it.
You can adjust the background noise reduction as a percentage of the original clip’s sound (0% represents no background noise reduction, and 100% represents the maximum reduction).
Play back the clip to test your adjustment, and then refine the position of the “Reduce background noise” slider.
Apply an equalizer preset
iMovie includes a number of equalizer presets, which you can use to enhance or fix audio in your movie. For example, you can choose an equalizer preset to enhance vocal quality, or boost bass or treble in a clip.
In the iMovie app
on your Mac, select one or more audio clips (or video clips with audio) in the timeline.To show the equalizer controls, click the Noise Reduction and Equalizer button.
Click the Equalizer pop-up menu and choose an equalizer preset.
