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"Serve the Servants"
The first difference is immediate. In between the 2nd and 3rd beats of the count-off, Cobain (I think) says "Ok" and clears his throat before the first chord. The classic, morbidly poppy lead riff is supported by another guitar harmonizing behind it. You'll also notice that the vocals are a lot dryer, and the rhythm guitar is quieter. My favorite parts about this one are the added cello lines during the chorus, and the alternate, louder solo during the bridge. This is one of the most fucked up pop songs ever.
The drums are not as loud or pronounced, but Cobain sounds like all kinds of fucking evil throughout the song, especially during the chorus. The new mix really highlights how loud Cobain was screaming in the room; you hear more of the microphone capturing the room of the scream than his vocal cords. Same goes for the lead guitar. Emphasis is also added to the texture of the rhythm guitar's tone than its volume.
By track 3, you might have noticed that a lot of post-production processing has been scrubbed off, in favor of a more "organic" sound. Most of the vocals are evened out on the sound stage, and it really comes through on "Heart-Shaped Box." The fucked-up harmony in the verse is given more of a presence, and the placement of the guitar and backing vocals have been flipped from their original channels. Pay attention to that right ear: instead of hearing a blistering wall of a distortion pedal, as you do on the 1993 mix, you hear a third backing voice coming in with Kurt's "hey" and "wait." The solo, too, is less acerbic.
This is where the changes may start to bother the Nirvana enthusiast. Like: they took out the guitar count-in! But, on the other hand, they've made the bass' tone a bit tigther and louder, and the guitar during the verse is less shimmery. The outro refrain has more of an echo and less of a volume boost. Overall, I think it makes this song sound less one-sidedly rage-filled, but more enraged and depressed.
"Frances Farmer Will Have Her Revenge on Seattle"
The first thing I noticed is that there's no tape hiss on the new 2013 mix (note: I didn't go into ultra nerd mode and triple-check that the 2007 Mobile Fidelity Sound Lab remaster got rid of the tape hiss or not). I also noticed that the two-note slide couplet stays firmly in the right channel on this new mix (it sounds more centered on the original). Kurt's guitar also sounds less like "I Wanna Be Your Dog" harsh. The bridge on this new mix sounds especially brutal.
Albini stated on the Kreative Kontrol podcast that the new mix was by no means meant to be a definitive version of In Utero, but another offering from a "different angle." Well, this is sure to make some fans frown: the cello in the chorus is totally gone. And though I appreciate actually hearing the strings on the acoustic guitar, and that the vocals have more room, the lack of chorus cello is a bit bothersome.