Yeah, you can trigger the audio on page load. I basically pasted the action (currently in the play button) in the same place that I put the audio player loading. So in the OnLoad of the dynamic panel, after the line where the audio player is created, I then trigger the play action. You’ll probably have to put a Wait (10ms) in between loading the player and playing it, or it won’t work.
I’m not sure about storing the audio locally, I doubt it’s possible unless you’re generating the Axure HTML files and then modifying them to point to the file.