There’s a quiet hum on the vocal track. And the acoustic guitar track. And about 10 other s. It’s the hard drive and cpu buzzing away and leaking on to the mic. Bummer. Get rid of it. All it really takes is some long cabling and a convenient closet and you can get that stuff off your record.
It might seems like a small amount of a quiet sound is no big deal – and often it’s not – but when you multiply that little mosquito times as many tracks as it’s on, it ends up clouding your mix, occupying the ambient space, and generally being annoying.
So many people are recording with a mic at their desk in front of the computer. I do it all the time, it’s a nice way to work. So get those noisy drives out of there!