In the Enhance section, enable the "Reduce background noise by" checkbox and drag the slider to specify a percentage of the effect to apply ( Figure 4.38). Open the Audio inspector by double-clicking the clip and then clicking the Audio button in the inspector, or by pressing the A key.Still, it's worth a try, and it's easy to enable. I've found this feature to be hit or miss, so it really depends on the audio in the clip-it's better at minimizing subtle white noise than something more specific like wind noise. If your video contains a persistent hiss or hum, or if there's just enough background white noise in an environment to be distracting, you can filter the noise in iMovie. One thing to try is normalizing the clips: Select one, bring up the Audio inspector, and click the Normalize Clip Volume button. Another common audio problem you're likely to run into is varying volume levels among all clips in a movie.
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