> Haven’t figured out PC audio to my receiver though. I’ve basically given up.

While most motherboards do not have s/pdif connectors, most of them has pins on the board itself. Check out the manual of your mobo. If it has, you can use an s/pdif backplate, or a makeshift coax cable to hook it up to the receiver.

This is usually the best and cheapest way to get clear digital sound signal out of the PC case, and you can even pass through DTS and the likes.