Attempt #2...
1. No audio devices appearing in Sounds preference panel, except for an "Internal Audio Driver (Corel Painter)". I would like to use HDMI audio, as well as the audio jacks on my computer.
2. OS X Mojave 10.14.5, Gigabyte GA-H170-D3HP with an Intel i5 6500 CPU and MSI RX 470 OC...