The Yamaha DX7 synthesizer's clever exponential circuit, reverse-engineered - Ken Shirriff: http://www.righto.com/search/label/dx7?updated-max=2021-12-01T08:52:00-08:00&max-results=20&start=4&by-date=false
Yamaha DX7 reverse-engineering, part III: Inside the log-sine ROM: http://www.righto.com/2021/12/yamaha-dx7-reverse-engineering-part-iii.html
Yamaha DX7 chip reverse-engineering, part 4: how algorithms are implemented: http://www.righto.com/search/label/dx7?max-results=20