I found a tutorial on adding audio effects to Edge Animate compositions that could provide you with some insights into what you are looking for.
Did you figure this out? I would like to do the same thing but can't make it work.
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If you are unfamiliar with how to add buzz to your animate composition , try this : Edge Animate - Adding Sound Effects - YouTube
I have been looking at the buzz.js but I thought it could only control audio elements, not the audio of video elements.