This must be less legal than Savedeo (which only creates a video link), because if the extracted audio is hosted on the servers it's very likely an illegal copy. I'm not sure DMCA would help in this case.

auderio.com api is through mashape ..which is around 100 request per day .. any way this limit can be increased for hacker accounts ?

ah i see. I was wondering if its possible to make a configurable autoupdating podcast channel based on these audio files.

You can use the API from http://auderio.com and do whatever you want