First, the score was made with MuseScore. Then it was prepared as an iPad App by the MuseScore team who custom made the synchronization between the score and the music. I then recorded the iPad app as a video using the "Reflector" program for Mac OS X. The iPad app doesn't exist anymore because it was not compatible with new versions of IOS.
There's an article on the recording process here: https://opengoldbergvariations.org/news/recording-the-goldbe...
Anne-Marie Sylvestre used Pyramix as her DAW. I don't know more than that, though.