I have always just patched in Clover with Toleda's guide here and had no issues making sound work with my Hero X upgrade. Even after the last 10.13.5 update I had to do nothing. Download from here
audio_cloverALC.command.zip unzip, right click and hit open to bypass gatekeeper.
Full guide
https://www.tonymacx86.com/threads/applehda-realtek-audio-guide.234732/
Downloaded it and this is what I got in terminal
Agreement
The audio_cloverALC script is for personal use only. Do not distribute
the patch, any or all of the files or the resulting patched AppleHDA.kext
for any reason without permission. The audio_cloverALC script is
provided as is and without any kind of warranty.
File: audio_cloverALC-130.command_v0.5
Release Mode
Password:
EFI partition is mounted
/Volumes/EFI/EFI/CLOVER/config.plist is missing
No system files were changed
To save a Copy of this Terminal session: Terminal/Shell/Export Text As ...
logout
Saving session...
...copying shared history...
...saving history...truncating history files...
...completed.
[Process completed]