Apple Keynote (Macintosh / iOS Only)
Step 1: Create your Slides: Keynote Support
Step 2: Add your Audio Narration: : See the section on Record a voiceover narration at Keynote for Mac: Add video and audio to a presentation
Step 23: Keynote for Mac: Save Export a Keynote presentation in to PowerPoint or another file format
General Keynote Help for Mac | General Keynote Help
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NOTE: If you created your narrated presentation on a Mac using PowerPoint, the audio will not play in the video. You can how ever take the .ppt file to a Windows computer, open it in PowerPoint and covert it to a video.
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Basic Steps to Add Narration in Keynote: