Hidden guitar starts at 0:00, 0:36 and 1:48. Rhythm (2nd layer) guitar starts at 1:11 (when the "fake guitar vocals" solo part starts). Both guitar parts played by Kurt Cobain.
These tracks lend excellent insight into Andy Wallace's *HUGE* guitar sounds and how he achieves their incredibly lush, rich harmonics and "chorusing" effects ("chorus" as in the electronic effect, not a part/"hook" of a song for those not familiar with music/recording equipment) and how good his ears are. It goes way beyond amps, guitars, EQ'ing and effects. Andy is layering *TONS* of guitar tracks at different audible levels. Many with slight variations in chords, chord shapes and/or octaves like these parts here. In the album mix, these parts are barely audible and when heard in context with the rest of the tracks, are so low in volume as to seem negligible to most listeners. Nonetheless they play a key role in the final guitar sound. He still works with talented musicians and has fantastic skills in adjusting and applying EQ, compression and outboard effects (the "twiddly bits" you see in racks next to mixing desks in recording studios which can add anything from reverb to pitch shifting/autotune and anything in between) but it's his ability to hear, layer and discern multiple, multiple tracks of instrumentation and vocals each at ever so slightly to extremely different levels of volume and panning (position left to right in your stereo speakers/headphones) in relation to each other to achieve the desired effect with minimal application of artificial/outboard effects. His mixes just sound *HUGE.* Particularly in the heavier guitar based rock music he has mixed, recorded and/or produced and it's in no small part to this ability to subtly layer differing tracks of guitars.
