Keynote Voice Over and Export
Open Keynote
Open up your PowerPoint Project in Keynote
Edit your Presentation with the Inspector
Make a slide show recording.
Talk about your project.
Explain and describe your presentation.
Go to your first slide.
Open the Inspector / Document Inspector / Select Audio / Record
Use the down key (arrow) to move to the next slide.
Press esc when finished
Export Your Presentation as a Quicktime Movie