Some type of room treatment and some type of isolation to record vocals with a mic.
My recording/mixing room is semi live. I'd guess a little more on the drier, less reflective side. The wall behind my screen and monitors has a canvas art deco thing with foam stuffed invisibly into the back 1 1/4 depth of it. The wall behind me has a thick 6 x 8 art deco throw rug stapled to it. To my left and right are book shelves with books, guitar amps, and other junk.
For recording vocals I rigged up some U clamps, (the kind used to hold electrical conduit to a wall) upside down on top of one of the taller book shelves. I run 1 inch PVC pipe into the U clamps. The PVC pipe stick out about 3 ft across or right behind my computer desk chair. I drape a couple layers of sleeping bags over the pipes and record my vocals underneath. I'm 2 - 3 feet away from my DAW desk and wireless mouse. The whole thing sets up and tears down in a few minutes and stores between the book shelf and the wall or on top of the book shelf.
I don't need a mixer but I sure find it useful. I use a Yamaha MG12CSX (not USB) propped up vertical on a guitar stand on the desk to the left of my screen and left monitor. It's basically a monitoring, practice, listening, lessons mixer. I have 2 - 3 pairs of separate listening monitors, one which is a typical 2.1 computer speaker set with a subwoofer, connected to the various outputs plus a 4 channel headphone amp running off the the headphone jack. The monitoring output of my Audio Interface goes into 2 channels on the mixer. For recording I plug my mics and instruments into the Audio Interface which goes USB directly to the DAW, by-passing the mixer. The MG mixer set up like this allows me to add a little of the MG's built in reverb to headphones during vocal recording, easily raise and lower the volume of 2 - 3 monitoring speaker sets, flip mono/stereo on the fly, plug in my hardware synth and drum machine for stereo/mono playback and recording, practice mic and vocal techniques, play around in all sorts of ways like getting my electric or acoustic guitar tone dialed close before I go out and play somewhere.
Anyway, I don't "Need" it but I would replace it if it fried. Maybe with a 8 - 10 channel but not one of the USB units. At least not one of the current USB mixers on the market. I'd stick with a good Audio Interface for USB to DAW.

Last edited by Tobias; 05/11/17 10:50 AM.
Does the noise in your head bother me ?