Using iLife ’11: How to Control Volume and Fading on iMovie Video Projects
With iLife video projects, you can control the volume and fading for a voice-over, sound effect, or music clip directly in the iMovie Project Browser. Click the Audio Waveform button in the lower right corner of the Project Browser window to show the audio waveform underneath each audio clip. You can then drag the volume line in the waveform up (to raise the volume) or down (to lower the volume), and the waveform representing the audio moves up or down with it.
To fade the audio at the beginning or end, click the tiny, white Fade button on the volume line at the beginning or end, and drag it toward the middle. You can adjust the fade points to shorten or lengthen each fade.
You can also edit only a portion of the audio — click the audio waveform once for a clip, and a yellow rectangle appears defining the area to make your adjustment. Drag the edges of the rectangle to cover the area of the waveform to adjust, and then drag the volume line to adjust the volume.
To more precisely control the volume level of a voice-over, sound effect, or music clip, select its marker in the Project Browser and choose Window→Audio Adjustments. The Inspector’s Audio pane appears.
To adjust the audio volume, drag the Volume slider in the Inspector’s Audio pane to the volume level you want for the clip. Drag the sliders for the Fade In and Fade Out controls to increase or decrease the fade into the sound clip and out of the sound clip.