Kafkaesqui on "Publish only the feed?"

"Hopefully either they could link directly to the MP3s, or maybe I could set up some sort of redirect."

http://wordpress.org/support/topic/43645#post-245607

Along with the add_filter() lines at the end of that plugin's file, including this:

add_filter('post_link', 'RSS_guid', 42);

should hit on all possible permalink issues except comment links.