https://microtonaluniversity.org/index.html https://www.afmm.org/aboutus.html https://en.xen.wiki/w/Just_intonation
https://www.youtube.com/watch?v=xcSod-sj2CE
https://sethares.engr.wisc.edu/papers/hyperOctave.html https://sethares.engr.wisc.edu/papers/hyperInstruments.html