One amp settings — Harley Benton HB-20R

The Metallica guitar tone for “One”, dialed in for a Harley Benton HB-20R with a Mooer MSC 18 Pro 2. Studio version, ...And Justice for All (1988) — iconic clean intro & verses

Original rig

Roland JC-120 (built-in chorus), ESP MX-220 with EMG 60 (neck), Mesa Boogie Mark IIC++ (distorted parts)

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

Amp settings — Harley Benton HB-20R

CHANNELClean channel (Channel Select button out)

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

01Analog Chorus Pedal (Boss CE-2 style)

RECOMMENDED — not currently owned; essential for the signature shimmering JC-120 chorus texture

Rate 4 · Depth 6

Why these settings

The HB-20R lacks the pristine stereo headroom of a Roland JC-120, so keep the clean volume/gain very low to prevent solid-state clipping. We scoop the mids slightly to 4 and lift treble to 7 to replicate the glassy '80s studio EQ profile. Distorted bridge/solo sections: switch to the drive channel with gain at 8 and mids scooped to 3.

PRO TIPPick lightly with the flat edge of a stiff pick directly over the neck pickup to recreate James Hetfield's percussive attack without inducing harsh preamp breakup on the solid-state front end.

Get this tone on your amp

These settings are for a Harley Benton HB-20R. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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Song, artist and gear names are used to identify the tone being matched; ToneAdapt is not affiliated with or endorsed by the artists or manufacturers mentioned. Settings are AI-generated starting points — trust your ears.