Apple iMovie User Manual download pdf (Page 37)

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Luanne Eris Fose, Ph.D.

Figure 26: Fade In and Fade Out in Audio Tracks

Viewing Audio Waveforms (New in iMovie 4)

Audio waveforms, shown below, are a graphic representation of audio intensity. While an

individual audio file can have a number of channels (such as left and right), iMovie’s waveforms

average all the channels in one waveform.

You can use waveforms to see where an audio clip builds in intensity and use these visual cues

to better align your video frames to the audio. Increasing the zoom of a clip allows you to see

more detail in the waveform.

To turn on waveforms:

1. Choose iMovie>Preferences and click the Show audio track waveforms checkbox.

2. If you don’t see waveforms in your tracks, deselect the Edit Volume checkbox. To

see more detail in the waveforms, move the Zoom slider to the right.

Snapping Audio to Video (New in iMovie 4)

When snapping is turned on in your movie, you’ll see a yellow snap line (shown in the

illustration above) appear as you reach the end of video and audio clips or come within 3 or

more frames of audio silence. When the yellow snap lines of your audio and video align, you’ll

have a very precise fit that would be difficult to achieve without snap lines.

To turn on snapping:

1. Choose iMovie>Preferences and click the Timeline snapping checkbox.

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Apple iMovie User Manual Page 37