One amp settings — Valeton GP-200

The Metallica guitar tone for “One”, dialed in for a Valeton GP-200 with a Ibanez RG550. Studio version, ...And Justice for All (1988) — signature heavy machine-gun rhythm riff & solo section

Original rig

Mesa Boogie Mark IIC+ (preamp slaved into Marshall power section with classic 5-band graphic EQ V-curve), ESP Explorer / Jackson King V with EMG 81 bridge pickup, Roland JC-120 (clean intro)

Aggressive, razor-sharp scooped-mid thrash metal rhythm with tight low-end and biting top-end attack

Amp settings — Valeton GP-200

CHANNELMesa Mark series / Cali Lead model + 4x12 Recto V30 IRBRIGHToffBOOSToff

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

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Guitar

PICKUPbridge TONE10 VOLUME10

Signal chain

01Screamer / Green OD Block

Clean boost in front of the amp block to tighten the low-end palm-mutes

Drive 0 · Tone 6 · Level 8

02Graphic EQ Block

Placed post-amp block to replicate the iconic Mesa Boogie 5-band Mark series V-curve scoop

80Hz 6 · 240Hz 7 · 750Hz 2 · 2.2kHz 7 · 6.6kHz 6

Why these settings

The GP-200 Cali Lead model captures the saturated preamp bite of the Mark IIC+, but the classic Justice scoop requires the post-amp Graphic EQ block with 750Hz pulled down. Your RG550 passive V8 bridge pickup has slightly less aggressive output and compression than Kirk and James' active EMG 81s, so the Screamer block in front tightens the transient pick attack for the machine-gun triplets. Clean intro: switch amp block to Roland JC-120 Clean model with a gentle chorus block enabled.

PRO TIPPick aggressively with a heavy, sharp pick directly over the bridge pickup and angle the pick slightly forward so the edge slices the string, producing the signature percussive 'click' on the muted galloping rhythm.

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These settings are for a Valeton GP-200. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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