I think one thing that made this happen is that this is a presentation made to exercise an interactive software tool that—although it can also be used for one's own experimentation—was mainly written to be used in the presentation. It's a case of making a custom "musical instrument" crafted to play exactly the song you're about to play on it. A lot like Bret Victor's "puppet controller" app in his presentation Stop Drawing Dead Fish (https://vimeo.com/64895205); or the actually-an-instrument "MIDI fighter" created by Shawn Wasabi for his music (https://www.youtube.com/watch?v=qAeybdD5UoQ, https://www.youtube.com/watch?v=Cj2eUpt3MVE).