Thank you brock! You are good at Eventiding.
Listening to La Cité des Saules is unlikely to offer any insight into the technical setup or how to play it, which is intentional. Spatialization is the concept/intent of the piece and the guitar with a volume pedal act more like a “controller” than a traditional instrument. To some degree, you have to take it on faith that “the right notes are the right notes.” This works if you have a Boss GX-700 and Digitech TSR-24, the processors the composer used, but if you do not have the same gear, you have to try and find different avenues to reach the same result.