Audio Syncing questions

I have a keynote that has an audio clip throughout, background music and narration. I'm assuming when the presentation starts the slides will only change on spacebar and not run by itself (timed slides?) Reason I ask is I need to overdub some sound effects within a few slides so should I drag the audio on to the slide and the audio will only play when the slide is being viewed correct?
On certain slides (2) there is a small video clip of a person speaking. If this plays only when the slide is viewable is there a way to duck the main audio (like in Garageband) while the audio fro the actual slide is playing?
any help?
rd

1. In the Viewer's Playhead Sync Menu (upper center), select "Video"
instead of "Video + Audio".
2. Sorry, neither of your ideas will work. Multiclips work with actual media
clips, so two clips will be two angles; and the sync method (in, out, timecode)
is the same for all clips.
I suggest you assemble the two files from the camera in a sequence (using
identical settings as the clips), sync them up exactly (with a little space
between them), and export them using the same settings to make a new clip,
which you can then import and use for your multiclip.
Have fun!
Les

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