I've seen aubio and it looks neat. If they've already SWIGged it for
python, it shouldn't be too hard to port to ruby.

BTW, I think the API is mostly not going to radically change anymore,
and I've got libsndfile working, if anyone needs it Right NowTM, it's
usable[1]. I'm going to do libsamplerate, and do some rubization of
those two libs, then make a release.

Jay: ecasound may indeed be just what you need. Interestingly, ecasound
has mp3 support by way of piping mpg123 into itself, if I understand
correctly.

1. `darcs get http://hans.fugal.net/src/ruby-audio`