Flash In PowerPower Point - Sound Plays Before I Get To Slide

Thanks to anyone that can help with this issue:

I successfully embedded two separate Flash files into a PowerPoint
file. They play well visually, however, the sound in the files start
immediately when I open the presentation. Given that the two files
feature two differents songs, it's a really headache!

What I'm looking to do is this: have the Flash file load/play when the
slide they're embedded in appears, not before and not after. Any help
with this would be much appreciated so I don't get overlapping music
issues!

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