NO SOUND - Media Components for Video

I followed this standard tutorial for importing Video into Flash step by step.
(http://www.communitymx.com/content/article.cfm?page=3&cid=A93B648DECD7574E)

I have a standard functional quicktime movie clip (.mov) that works with no problems until it is implemented with the mediaPlayback Component.

Details of the movie clip:
MPEG-4 Audio Stereo 16 bit
MPEG-4 Video 29.97fps

The video looks fabulous but the sound is stripped once its played back in the swf (and within flash as well).

I would like to note that when I follow the step-by-step with any other Quicktime movie, say the sample movie that comes with Quicktime, it works fine. So the problem must be the quicktime movie from my client?

Please advise!

Any help?

Daniel