Actually the best way to get audio works is use AppleALC + Lilu kexts from vit9696.
According with your MOBO, you have Realtek ALC887. So, first, download the kexts:
https://github.com/vit9696/AppleALC/releases/download/1.2.0/1.2.0.RELEASE.zip
https://github.com/vit9696/Lilu/releases/download/1.2.0/1.2.0.RELEASE.zip
Put these .kext on
/EFI/EFI/CLOVER/Kexts/Others (Use EFI Mounter to see EFI partition). Now open the file /EFI/EFI/CLOVER/
config.plist with Clover Configurator and on the tab "Devices" write in Audio -> Inject the layout watching the supported list
here. In your case, start trying layout 1. Save, reboot and test the audio.