Riff Tone

Breed (Rough Mix)

Nirvana

Guitarrock1990s

Original Gear

GuitarFender Mustang (early 1970s, likely Competition Blue, as used by Kurt Cobain on Nevermind sessions)

AmpMesa/Boogie Studio Preamp into Crown Power Amp, Marshall 4x12 cabinet (as per Nevermind studio sessions)

PickupsStock Fender single-coil pickups (Mustang type, likely bridge position for riff)

Amp Settings

gain8

bass6

mid4.5

treble7

reverb0

presence5.5

Effects & Signal Chain

distortionBoss Boss DS-1 Distortion

Notes

Studio recording, Nevermind sessions (1991), not live; gear confirmed for studio use on 'Breed' by multiple sources. 'Rough Mix' version is from the same session. DS-1 pedal confirmed for main riff. No chorus, flanger, or delay audible or cited for riff section.

Tone Character(10)

gritty and raspy distortioncompressed aggressionbright and cuttingpunchy low-endtight and percussive attackraw, saturated soundemphasized upper mids and trebleminimal low-mid muddinessaggressive, driving rhythmslightly scooped mids

Difficulty

The riff is fast and requires aggressive picking and tight palm muting, but uses simple power chords and straightforward rhythm, making it accessible to intermediate players.

Sources

Amp Settings for Breed by Nirvana (guitars and tone) - Guitar Chalk Kurt Cobain's Guitar Rig, Gear & Pedalboard Nirvana: Super Fuzz Big Muff | Guitar World

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