I wiped the entire system and did a clean install with just the Intel 530.
HDMI audio not working, and not displaying under Sound Output
OSX 10.12.4 / MSI Z170A-Tomahawk/E7970IMS.1B0/i7 6700k/Intel 530
Unibeast Install of Sierra 12.4, Installed Clover, Multibeast of Audio - ALC892, 100 series...