One amp settings — Line 6 Catalyst cx 60

The Metallica guitar tone for “One”, dialed in for a Line 6 Catalyst cx 60 with a Ibanez GIO GRG170DX. Studio version, ...And Justice for All (1988) — signature heavy machine-gun rhythm riff

Original rig

Mesa Boogie Mark IIC+ slaved into Marshall power section with 5-band graphic EQ V-curve, ESP Explorer with EMG 81, Roland JC-120 for clean intro

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

Amp settings — Line 6 Catalyst cx 60

CHANNELHi Gain voiceBOOSTon

Knob	Setting (0–10)
Gain	7
Bass	6
Mid	3
Treble	7
Presence	6
Reverb	1
Master	5

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Guitar

PICKUPbridge TONE10 VOLUME10

Signal chain

01Valeton GP-100 (Green OD / Tube Screamer Block)

Placed in front of the Catalyst input as a tight boost to clamp the low end before the preamp.

Drive 0 · Tone 6 · Level 8

02Valeton GP-100 (Noise Gate Block)

Essential to replicate the ultra-tight, dead-silent staccato stops of the machine-gun riff.

Thresh 7 · Attack 1

Why these settings

The Catalyst CX 60 is set to its Hi Gain voice with onboard Boost engaged, pulling the mids back to 3 to recreate the legendary Mesa 5-band graphic EQ scoop without collapsing the punch. The Valeton GP-100 acts as a zero-gain front-end boost and hard noise gate to tighten up the passive Infinity R bridge pickup compared to Hetfield's active EMG 81. For the clean intro arpeggio, switch the Catalyst to the Clean voice with gain at 3 and engage a light chorus block on the Valeton.

PRO TIPAnchor your palm directly against the bridge saddles and execute aggressive, synchronized downstrokes; the precision of the staccato machine-gun riff relies on stopping string vibration instantly between triplets.

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These settings are for a Line 6 Catalyst cx 60. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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