Readme line 2: unitgen was built for a demo being given at [Dance.js](http://dancejs.io/)

DanceJS: Saturday Oct 4th 2014, 6:45PM-11:30PM Perhaps after the show.

I didn't want to check-in the wavs (because they're huge). But, if you run `unitgen mixer --track1=foo.wav --track2=foo2.wav` and pass in two 44100 wavs, you can use `a` and `s` to play with the cross-fade.