Right now, i'm messing around with furnacetracker. It's got almost everything in one package! The chip I usually focus on is the YM2608 chip because it's close to a genesis chip. I'm still trying to wrap my head around it though, the third FM channel when split up is still a mystery to me lol
Oh I've heard of Furnacetracker! Wow I checked the GitHub, you weren't kidding. I may need to have a play. If you're into gameboys my friend's working on Retroplug and it's pretty neat!
That FM twang though, Ecco the dolphin on the Megadrive got me hooked as a kid. Are you playing with a hardware YM2608 or through Furnacetracker?