Updated to Mojave Public Beta 2 and the update went fine. Bluetooth, WiFi, analog sound, streaming to an Airport Express all working.
There was one glitch with Beta 1. All the fans in the GA-97-HD3 system w/Core I7 (liquid cooler and case fans) went wild. The white light around the processor went red and the processor temperature shot up to 91°C. The computer shut down. When this happened, I had four open tabs in Chrome - streaming SiriusXM and checking e-mail. I never had anything like this happen with High Sierra or Sierra.
Anyone else experience anything like this?