Audio Waveforms missing?

I clicked on "View Audio Waveforms" under "View" as I'm editing my movie.
I assumed that the waveforms would appear in the audio tracks. But as I started the clip, nothing at all appeared.
Can someone tell me what I'm doing wrong? Thanks.

Showing audio waveforms
http://docs.info.apple.com/article.html?path=iMovie/6.0/en/imv1133.html
Note: Waveforms are faint when you're showing clip volume levels. To hide clip volume levels, deselect Show Clip Volume Levels in the View menu. (A selected item has a checkmark next to it; choose the item again to deselect it.)
To see more detail in the waveform, it's a good idea to zoom in on the timeline viewer.
Sue

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