Creating a presentation to embed in online community

OK people, I need some suggestions for narrating a powerpoint thus creating a presentation that I can embed in an online environment, so not just as a uploaded file.

I have tried using the narration within power point but had trouble hearing it. I have tried slideshare but needed to record an mp3 fille so I used a podcast for this. This is probably the best option but I again I can barely hear my voice.

So I guess my problem is not the application but recording my voice so it can be heard....any suggestions for overcoming this problem?