Returning to a Slide and Suspending Narration

I'm working on a project that someone else set up. She has it so that you start at one slide and then select a topic to review and branch off to another series of slides. When those slides are complete you come back to the original slide, the topic(s) you chose are grated out and you choose another topic from the still active icons. However, each time you come back to the original slide the voice over for that slide starts up again. Can I suspend that narration so that it is only there the first time the slide is visited? Or is there a better way to make this all work?

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