One amp settings — Boss GT-100

The Metallica guitar tone for “One”, dialed in for a Boss GT-100 with a Epiphone Les Paul Standard 60s. Studio version, ...And Justice for All (1988)

Original rig

Mesa/Boogie Mark IIC+ head, ESP MX-220 with EMG 81 bridge pickup, minimal pedals (noise gate), Marshall 4x12 cabinet

Tight and percussive, scooped mids, aggressive palm muting, high-gain saturation with articulate rhythm clarity, crisp high end, chunky low end, dry

Amp settings — Boss GT-100

CHANNELRECTIFIER amp type (closest to Mark IIC+ voicing)BRIGHToffBOOSToff

Knob	Setting (0–10)
Gain	8
Bass	7
Mid	2
Treble	8
Presence	6
Reverb	0

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Guitar

PICKUPbridge TONE10 VOLUME10

Signal chain

01Noise Suppressor (NS block in GT-100)

Essential for tight palm mutes and dead stops—place before amp block

Threshold 4 · Release 3

02Graphic EQ (GEQ block in GT-100)

Post-amp block—this sculpts the signature AJFA mid-scoop precisely

100Hz 6 · 200Hz 5 · 400Hz 3 · 800Hz 2 · 1.6kHz 4 · 3.2kHz 6 · 6.4kHz 5 · Level 5

Why these settings

The GT-100's RECTIFIER model captures the Mark series' tight low-end and searing highs. Your Epiphone's Probucker humbuckers are passive and warmer than Hetfield's active EMGs, so gain is pushed to 8 (vs the original's ~7) to compensate for lower output, and treble raised to 8 to recover the EMG's clinical bite. Mid at 2 delivers the famous AJFA scoop.

PRO TIPHetfield's right-hand attack is the secret—anchor your palm firmly on the bridge saddles and pick aggressively with thick picks (1mm+), striking through the string rather than across it. The tone lives in the percussive 'chuk' of dead-on palm mutes.

Get this tone on your amp

These settings are for a Boss GT-100. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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