I plan to use SoundCloud to host my MP3 files, but run the iTunes RSS/XML through my own website. Therefore I need the permalink (or direct URL) to my hosted MP3 files.
I've seen some comments that suggest you can add "/download.mp3" to the SoundCloud URL, and that should force a download of the MP3 file. I'm not having that experience. Instead it just brings up a new SoundCloud player.