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Add sound effects in iMovie on iPhone
iMovie comes with dozens of free sound effects that you can add to your movie project.
Sound effect clips are coloured blue in the timeline. If you add an imported sound effect that’s one minute or longer, it behaves the same as background music in the project and is coloured green. See Add music and soundtracks in iMovie on iPhone.
In the iMovie app on your iPhone, open a movie project.
Scroll the timeline so that the playhead (the white vertical line) appears where you want the sound effect to begin.
Tap the Add Media button , then tap Audio.
Tap Sound Effects.
To listen to a sound effect before adding it, tap it.
To add a sound effect, tap it, then tap the Add Audio button .
See alsoAdjust audio in iMovie on iPhone