I'm not so sure about scoring backlinks from audio submission, but whatever you do, just make sure that the sources you use are very reliable.
For example, having links to your site from actual banks or other big businesses that have served customers for years or even from websites that have an excellent reputation on the net is very good.
Having links to your site from people or companies you don't know or as a result of doing something small for a random company might not go well because those kinds of sources might change for the worse in the future.
Whatever you do, make sure you can actually trust the source before using it.
Because I don't know details surrounding this audio site you talk about, my answer is probably the best answer you're gonna get.