Also had a painless update to Mojave through the App Store, with exactly the same audio issue and the same solution. The MultiBeast ALCxxx didn't work until I added optional 3 port 5.1 audio, and it now appears to be working fine. No other issues yet!GA h77n-wifi
Core i5 - 3570
AMD Radeon Amour RX570 OC 8GB
16 gb RAM
WD blue 250
I managed to get Majavi to install without a hitch - for the install part.
I had no audio so I reinstalled MultiBeast ALCxxx for my build no luck, next time I added Optional 3 port 5.1 Audio and it worked. I had not tried that previously.
Checked the - "configuration folder on the root of your system drive or EFI Partition using EFI Mounter v3. Copy FakeSMC.kext and any other extra necessary kexts to /EFI/CLOVER/kexts/Other/. If you need essential kexts, download them here.” But fortunately there was nothing I needed to do, or I could see. Maybe it was the audio but I missed it. No ... so far so good...