It might be any of a number of things, but try moving each item, mostly the laptop and the interface, slowly to a few inches away and rotating in another direction. If anything gets better, that's good. It means the buzz has to do with something's proximity to something else and you can make it go away. Household electricity in lights and large appliances are often culprits, but there are usually bad spots to be in and better spots noise wise. The same way an electric guitar's pickup might be making such noise through an amp but moving a foot and rotating around makes it go away.
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The reason rain dances work is because they don't stop dancing until it rains.
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