One amp settings — Boss Katana 50 MkII

The Metallica guitar tone for “One”, dialed in for a Boss Katana 50 MkII with a Epiphone Les Paul Classic. Studio version, ...And Justice for All (1988) — iconic clean intro & verses

Original rig

Roland JC-120 Jazz Chorus, ESP MX-220 (EMG 60 neck pickup), built-in Roland stereo chorus

Pristine, chorus-treated, slightly scooped high-headroom 80s clean

Amp settings — Boss Katana 50 MkII

CHANNELClean amp typeBOOSToff

Knob	Setting (0–10)
Gain	2
Bass	6
Mid	4
Treble	7
Reverb	3
Master	5

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Guitar

PICKUPneck TONE10 VOLUME10

Signal chain

01Onboard Mod: Chorus (Boss CE-2/Stereo Chorus block)

Engage the Katana's onboard MOD section set to Chorus to recreate the Roland JC-120 chorus

Rate 4 · Depth 6 · Level 5

Why these settings

The Clean amp type on the Katana 50 MkII emulates the ultra-clean solid-state headroom of the Roland JC-120. Setting gain low preserves maximum clarity, while a slight mid scoop (mid at 4) and boosted treble compensate for passive humbuckers relative to Hetfield's active EMG 60. Katana 50 MkII lacks a physical presence knob, so upper-end glass is shaped entirely via the treble control.

PRO TIPPick lightly near the neck pickup using a thin or nylon pick to emulate the smooth, non-percussive transient attack of the album's double-tracked clean intro.

Get this tone on your amp

These settings are for a Boss Katana 50 MkII. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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