Have you checked if your line outs are working? I do not have HDMI audio working but I do have sound from the Line outs.
Before installing the VoodooHDA 2.8.9 kext I had no options for sound whatsoever so its better than nothing for me for now
Voodoo does not support Intel HDMI audio.Installed voodooHDA 2.8.9.
Line outs have sound, but no HDMI Audio.
Voodoo does not support Intel HDMI audio.
This is a ALC1220 thread, off topic.getting HDMI Audio working is essential.
See
This is a ALC1220 thread, off topic.
Note: no native macOS/Kaby Lake/HD630 support currently
The Skylake/FakePCIID solution may work, try HDMI Audio AppleHDA/cloverHDMI. Post to the linked thread.