Imho there should be a field in the post editor where I enter the URL of the item enclosure.
If there’s nothing there, no enclosure.
Scraping the HTML gives unpredictable results.
Apparently it misses the MP3 sometimes, as in this post:
http://rebootnews.com/2009/12/17/rebooting-the-news-37/
A Google search shows the problem has been reported.
UNBERKELEY 