Alright, I moved back to my motherboard audio and was content besides the fact that I had a box that I wasn't using the full potential of. I plugged in my headphones to the interface, thought ya know, what if I changed the USB ports? By god, it worked. The audio was no longer muddy. The thing was working how I wanted it to. That was a couple days ago. I had been fiddling with the thing because I had been getting some crackling and popping in my headphones and I wondered what I could do to stop that. Being someone who knows a lot about technology, the first thing I tried, before looking it up for any troubleshooting, was unplug the 1/4" to 3.5mm adapter, and plugged it back in. I had been doing that several times recently. Today, I booted up my PC, and I realized that when I joined a discord call, it seemed like the frequency response had been cut in half, the highs had just been stripped from my headphones. This was what I had been having before, when I said it sounded muddy. It sounds as if there was a very crappy implementation of virtual surround sound. I was flabbergasted, as I had been in a new USB port and thought that that was my fix. I unplugged my adapter again, looking at the tip of it. After the second green ring, the tip of it had extended, as if it were popping out of the assembly of the adapter. I unplugged my headphones from it, and pushed it back into the assembly. Plugged them back in, put it back into the audio interface, and voila: it's working perfectly now. Thank you for the help and suggestions that you've given me, I can finally rest assured that the thing that was screwing me over was my 1/4" to 3.5mm adapter.