I've always been passively interested in this subject so this is super duper interesting! I also wanted to ask: on your page regarding the soundbond code, you mention a similar, old code for autistics! Do you happen to have the link to that? It sounds very interesting!
This is the variation I was able to find. I don't know much about it or who made it, though. https://web.archive.org/web/20080616220325/https://autcode.neurelitism.com/
THANK YOU SM!