nVidia gPU in High Sierra, can see the audio controller but not sound output?

I have a Z390 + GTX1070 + i5-8400 system working in High Sierra 10.13.6. Everything seems working fine except the hdmi audio.

I did put Lilu.kext and AppleALC.kext under kexts/other, and i dont have any other audio related kext installed.

And i was able to see the gpu audio controller in hackintool, but not in system sound preference. Webdriver installed latest.

Any insights?

https://i.redd.it/xk0tazafpfr31.png

https://i.redd.it/lsodeyafpfr31.png