1) Select the clip in FCPX and bring up the inspector (command-4). Click on the audio tab. Under channel configuration, make sure an audio channel is selected.
2) If that doesn’t reveal the problem, verify the clip is good and the codec isn’t something unusual. Do this by right clicking the clip and selecting reveal in finder. Open the file in quicktime. Play it back and make sure there’s sound. If there is sound, go to the menu and choose Window–>View inspector. What does it say under format?
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