Okay, I just (few days) bought a XLR Female to 1/4" Male cord, plugged it into the mic out (which is switched to mic out), plugged it into my computer, and...I'm still getting the weird noise. You can't hear it as much as if it were running through the headphone jack, but it's still there. I have the rest of this post in audio form, if you would care to listen. The audio file has the offending sound and me talking.