Tone library / Red Hot Chili Peppers / Under the Bridge

Under the Bridge amp settings — Fender Champion 20

The Red Hot Chili Peppers guitar tone for “Under the Bridge”, dialed in for a Fender Champion 20 with a Donner Pro plus. Studio version, Blood Sugar Sex Magik (1991) intro & verse

Original rig

1966 Fender Jaguar / 1962 Fender Stratocaster into Marshall Major 200W / Silver Jubilee with MXR Dyna Comp

Snappy, percussive, glassy vintage clean with high presence and subtle compression

Amp settings — Fender Champion 20

CHANNELVoice: '65 Twin CleanBOOSToff

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

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Guitar

PICKUPneck+middle TONE10 VOLUME10

Why these settings

The Fender Champion 20 lacks a dedicated mid knob, so the mid parameter is set to null. Selecting the '65 Twin voice yields the chime, clean headroom, and snappy response of Frusciante's dynamic clean tone without breakup. Treble is pushed to 7 to deliver the glassy bite of the original track's single-coil spank through an 8-inch speaker.

PRO TIPFrusciante wraps his thumb over the neck for Hendrix-style bass notes while striking the treble strings with a light, snappy wrist flick to maximize percussive pick attack.

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These settings are for a Fender Champion 20. 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.