One amp settings — Fender Rumble LT25
The Metallica guitar tone for “One”, dialed in for a Fender Rumble LT25 with a Ibanez GIO GRG170DX. Studio version, ...And Justice for All (1988) — iconic clean intro & verses
Roland JC-120 (clean) / Mesa Boogie Mark IIC++ & Mark IV heads (heavy riffs), ESP MX-220 with EMG 60/81 pickups
| Knob | Setting (0–10) |
|---|---|
| Gain | 2 |
| Bass | 5 |
| Mid | 4 |
| Treble | 7 |
| Master | 6 |
01Onboard Chorus FX Block
Engage the built-in chorus modulation block on the Rumble LT25
02High-Gain Distortion Pedal (e.g. Boss DS-1 or Mesa-style dirt)
RECOMMENDED — not currently owned; needed for the heavy machine-gun section
The Fender Rumble LT25 is a bass modeling combo with no presence control and full-range speaker response, so treble is boosted to 7 to replicate the glassy Roland JC-120 sparkle while bass stays flat at 5 to avoid boominess. The neck humbucker mirrors James Hetfield's EMG 60 clean voice, and the onboard chorus block supplies the wide 1980s stereo shimmer. Heavy bridge sections: engage the onboard Fuzz/Distortion stomp block on the LT25 preset or switch to a high-gain model like Modern Bass OD.
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These settings are for a Fender Rumble LT25. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.
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