[linux-audio-dev] sbagen2?

Hi all, I am trying to create a mix from a non jack application sbagen with a bunch of mp3's. My son who is ADD has some songs he really loves, which I have mp3s of. I created a script file for sbagen to produce binaural beats but now I would like to create a mix. songs in one track the binaural beats in another. I tried sox and ecasound but sox didn't like being piped from standard out. I couldn't figure out ecasound but I would love to use ardour or rezound if possible. how do I go about feeding the output of sbagen to a recording application (what application should I use for this) I don't need a fancy mix because it is for my special education child and he won't care about quality. I do need a way to bring this about. Thanks Aaron