Some people have expressed surprise and disappointment at the fact that this screencast have no audio.
Let me repeat that the manipulations demonstrated in this screencast are only meant to show how to use the interactive documentation (and, as a side effect, also introduce the basic ideas of "composition by projection").
The musical phrase produced here is constantly changing and has no particular musical value; it is in no way a finished composition. Besides, since it is similar in kind to MIDI data, it does not even have a specific sound to begin with.
Remember that what happens when you randomly play with a musical composition software is very similar to what happens when you randomly play a musical instrument: you get noise.