This question was asked a few years ago, and nobody knew the answer. Has anyone got any new information?
“I've added the following (http://dts.podtrac.com/redirect.mp3/) prefix to the box on the content page in settings, as this is the URL provided by Podtrac, and in their instructions for Soundcloud users. However, when I click the info link by the box on Soundcloud itself, it advises that I use a different URL (http://www.podtrac.com/pts/redirect.mp3/). Which is the correct one to use? “