This is really cool. For anyone else who wants to run this on Mac OS X, try installing sox first (brew install sox). That's all I had to do and then I was up and running.

A quick melody from a favorite song that I transcribed: "D4 A4 D5 F5 D5 A4 D4 A4 D5 E5 D5 A4 G3 G4 A#4 D#5 A#4 G4 G3 G4 A#4 D5 A#4 G4 A3 E4 A4 D5 A4 E4 A3 E4 A4 C#5 A4 E4"

I love to see the command line put to good use like this!