The best current resource is the Kyle Gann book, "The Arithmetic of Listening". It's fantastic, by a world authority on the topic. https://www.kylegann.com/Gannbooks.html
Also for anyone interested in just intonation based microtonality, I did a video demo of a tool I made using my open source Scheme for Max extension to Max here:
Also for anyone interested in just intonation based microtonality, I did a video demo of a tool I made using my open source Scheme for Max extension to Max here:
https://www.youtube.com/watch?v=2L7edwef-5k&t=2s&ab_channel=...