This can happen if the clip volume has been lowered or a fade-in has been applied on an audio clip in the narration or music track and if the clip is preceded by silence. If this occurs on an audio clip in your project, follow these steps:
1. Create a new project.
2. Go to the Sound tab within the Edit Movie tab and click the Import button.
3. In the dialog box that appears, navigate to the media folder of the project that you are having the problem with.
4. In the media folder, select the audio clip that is having the problem. If you are not sure which one it is, you can use the Play Sound preview button on the left. When you have selected the correct file, click the Open button.
5. Click on the clip in the timeline to select it, then adjust the clip volume and the fade options for the clip as you want them in the original project. Note: Do not move the clip in the timeline. Moving the clip could cause the problem to reappear.
6. Go to the Send Movie Out tab and click the "Save movie for..." radio button.
7. Select "Avid Cinema" in the pop-up window below and click the Start button.
8. Give the movie an appropriate name and save it in the media folder of the current project.
9. Close the project. There is no need to save the changes in this project.
10. Open the original project.
11. Remove the audio clip with the problem from the timeline.
12. Go to the Sound tab within the Edit Movie tab and click the Import button.
13. In the dialog box that appears, navigate to the media folder of the previous project and open the movie that you just saved.
14. The corrected sound will appear in the Music track of the timeline. Drag the new clip to the desired place in the timeline.
The sound should now play back properly. You should not need to adjust the clip volume or fade options since the this was done in the previous project. If you do adjust the clip volume or fade options on this clip, the problem may reoccur.