This is really informative, and the simple FM-synthesis demo confirmed my guess as to what the term meant (since I could never be bothered to look it up). Fun!
Is there a highly-regarded software (or hardware + software) emulator for the DX7?
I would recommend Plogue's OPS7, they have put considerable amounts of time and effort into reverse engineering the original chips. The interface is a little clunky but it sounds fantastic. https://www.plogue.com/products/chipsynth-ops7.html
Is there a highly-regarded software (or hardware + software) emulator for the DX7?