Audio in iMovie-  mono to stereo  help please

I have an entire 20 minute project in imovie that was recorded with a at835 mono shotgun mic. The audio sounds fine on my computer but poor and faint on other dvd players with their speakers. I was told that my audio files are in mono and need to be in stereo. How can i do this? and is there an easier way for my future use?

Hi Mark:
Dan is a genius...
http://www.danslagle.com/mac/iMovie/audio/1002.shtml
http://www.danslagle.com/mac/iMovie/tips_tricks/6012.shtml
Merry Christmas!
Sue

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