I've heard it and it sounds like a single fart plop in a bath.
All of a sudden I went off the idea of hearing the gravity wave signal.
When you say "I've heard it" do you mean you have heard the actual signal in the news story? If so where? How?
Or do you mean one of the many audio simulations?
OK I found that black hole fart sound on the video in the BBC news story. I don't believe it's the real thing.
We could recreated using the graphs of the signals in the Nature story http://www.nature.com/news/einstein-s-g ... st-1.19361
Could be a job for sonic-pi
Memory in C++ is a leaky abstraction .