Thanks, Toleda, so I took these instructions which I hope were the correct ones:
X99/Intel High Definition Audio (Workaround requires 1, 2, 3, 4 and 5)
Rename dsdt/ALSA to HDEF (Select one method)
Clover: Download/config-audio_cloverALC-x99.plist.zip
Add config.plist/ACPI/DSDT/Patches/Rename...