Duality amp settings — Boss ME-90

The Slipknot guitar tone for “Duality”, dialed in for a Boss ME-90 with a Ibenez Gt. Studio version, Vol. 3: (The Subliminal Verses) (2004) — Mick Thomson's main riff tone

Original rig

Marshall JCM800 2203 blended with Rivera Knucklehead, Ibanez MTM1 with EMG 81/60 pickups, Maxon OD820 as boost, Boss NS-2 noise gate, Drop B tuning

Crushing palm-muted chug with tight low-end, aggressive upper-mids, machine-gun attack

Amp settings — Boss ME-90

CHANNELR-FIER amp type (Orange LED / Modern mode)BRIGHToffBOOSToff

Knob	Setting (0–10)
Gain	7
Bass	5
Mid	6
Treble	6
Presence	5
Reverb	0
Master	8

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Guitar

PICKUPbridge TONE10 VOLUME10

Signal chain

01ME-90 OD/DS Block — T-SCREAM

Used as a tight boost into R-FIER — adds mids and tightens low-end, not for clipping

Drive 3 · Tone 6 · Level 7

02ME-90 NS Block — Noise Suppressor

Essential for drop-tuned high-gain — tames buzz between chugs

Threshold 5 · Release 4

Why these settings

Original used a JCM800 boosted by Maxon OD820 for tight saturation. ME-90's R-FIER (Rectifier-style) gets closer to the saturated chunk than its MS1959 model. T-SCREAM at low drive pushes the front end and cuts flub — this replicates the OD820 boost role. Gain 7 instead of 8 because R-FIER runs hotter than a stock JCM800; mid bumped +1 to compensate for the Rectifier's inherent scoop vs Marshall's mid-forward voice.

PRO TIPPalm mute directly over the bridge saddles, not further up the strings — Mick's attack is extremely precise and close to the bridge for maximum chunk and minimal string flap in Drop B.

Get this tone on your amp

These settings are for a Boss ME-90. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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