Some people do have problem understanding AppleALC, how to use it for their own codecs. Here's how I used it for both Realtek ALC and IDT audio codecs.
For more info on Catalina click here.
I'm currently using AppleALC inside /EFI/Clover/Kexts.
Sound works fine through Laptop speakers. However, as soon as I connect my earphones, i start getting a continuous buzzing sound. Can anyone help me with this?