This is where the review turns cautionary. MultiBeast 11.3.0 is heavily tied to Clover Bootloader. multibeast 11.3.0 - mojave
Mojave removed native support for NVIDIA "Web Drivers" for newer cards (unlike High Sierra). This is where the review turns cautionary
If AppleALC (installed by MultiBeast) doesn't give you sound: multibeast 11.3.0 - mojave