Did you expand the lists in the Device Manager? Here I have 3 sound devices installed, my Audigy card, the HDMI (video and sound on my video card) and the mobo sound board. I disabled two sound devices to solve my sound problems because I wanted to use my Audigy card.
try using the sound from your PC instead of the HDMI sound. Disable all you're not going to use.
You'll find the W10 is good at making everything work but you don't want everything to work, you'll have conflicts.