I've recorded my audio to a Keynote slideshow presentation which has two videos with audio already included that are now double audio. How do I rerecord one audio?

I'd put together a slide presentation in Kaynote '09, to be presented while I speak. Now I want to make a video or movie of the presentation with my audio. The presentation has two videos inserted with audio. When I recorded the presentation with my audio, the videos have double audio. I realize I need to rerecord but how do I keep the inserted videos from doubling audio but still be inserted in the final timing and video? I have searched, but can't seem to find an answer to this problem. Thanks to anyone that can help.