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My drivers are all up to date, my cords are all correct, my audio splitter is set up nicely. I hear the game in my ears, but OBS only picks up a hissing sound.

I did follow prior advice to enable listening through another device, but this also only produces a hissing sound. Let me know if I need to give any more info or anything.

What kind of splitter, and where is it plugged into on your pc?

I typical splitter, I think. A UGreen 3.5mm in my audio jack.