Anyone know which software Rafael Lozano-Hemmer using in his Sphere Packing piece?

Hi all

Do anyone have any clue maybe what type of software Rafael using in his Sphere Packing piece that I can start my research?

https://www.lozano-hemmer.com/sphere_packing_bach.php

I am exploring the possibility to better control each channel and each speaker in my sound installation. Any input and suggestions would be super appreciated! 🙂

Thank you so much for the help in advance!