Thanks for your advice. I initially started with Microsoft Movie Maker, but unfortunately it was very glitchy -- I couldn't even get my images to show in the preview window, and subsequently learned from online research that this is a common problem with MMM. So I bought Wondershare, but I'm finding it's text capabilities to be inadequate for my purpose.
But maybe I can fool around with your advice using Wondershare instead of MMM.
It’s been a while since I fiddled around with PowerPoint packaging. I’m sorry I can’t be of more help.
Please ping me when you do arrive at a suitable solution. I’d like to learn from your experience.
Thanks!
I’ll add one more thing.
The tool that I found indispensable in the past was this:
Total Recorder:
http://www.totalrecorder.com/
The VideoPro version is $53.
I was able to manipulate video and audio with very high quality results.
There’s a trial version you can try first.