@NorthAmTransAm,
Thanks for your amazing work!
I attempted to update from Mojave, which was working perfectly, to Catalina. Everything works (though it seems very sluggish) except for audio, the only option being HDMI, not the optical port which I do need. I grabbed the EFI you created for cnsilvan since I have a rev 1 board. What am I missing?
BIOS is up to date. Based on another post I read, I wiped the EFI > clover folder from my Mojave install as I was running a 4xxx version of Clover, so essentially starting from scratch.
I don't have the Thunderbolt card as I use Dante Virtual Sound Card for getting audio in/out, but I imagine having the kexts installed won't hurt?