Hey Hlp, I hadn’t heard of the Antumbra version! You mean this?
Certainly looks VERY cool, though I’m skeptical of anything without the hardware. Agree that I have noted before the YuSynth sounds very close. Sound is a lot of it, but I think what any of these models without inductors miss is the irregularities, I haven’t had enough time with the Yusynth to say it gets there with the random interference. Sounds very good when you first listen to it. I like how inductor models are always a little different each time, however. That’s the tricky quality of them.
I think someone could approximate things if they placed an antenna in the signal path to either introduce interference or just the smallest amount of signal instability. A very low current of ramping up and down irregular noise into the CV of one of the FFBs that accept into into a VCA might get there.