Gravity amp settings — Boss Katana 50 MkII

The John mayer guitar tone for “Gravity”, dialed in for a Boss Katana 50 MkII with a Squier Affinity Stratocaster. Studio version, Continuum (2006) — main rhythm tone

Original rig

Two-Rock Custom Reverb Signature / Dumble Steel String Singer + Fender Custom Shop Stratocaster ('The Black One') + Klon Centaur / Marshall Bluesbreaker

Warm, scooped, dynamic edge-of-breakup clean with blooming low-end and airy top-end

Amp settings — Boss Katana 50 MkII

CHANNELClean Amp Type (Variation Off)BOOSToff

Knob	Setting (0–10)
Gain	4
Bass	6
Mid	4
Treble	6
Reverb	4
Master	5

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Guitar

PICKUPneck+middle TONE9 VOLUME9

Signal chain

01Katana Onboard Booster (Blues Driver block)

Enable onboard Katana Booster (Green/Blues Driver mode) to emulate Mayer's transparent transparent edge-of-breakup overdrive

Drive 2 · Tone 5 · Effect Level 7

02Marshall Bluesbreaker / Keeley Katana Clean Boost

RECOMMENDED — not currently owned; adds authentic Mayer-style mid-bloom and touch sensitivity

Drive 3 · Tone 5 · Volume 7

Why these settings

The Clean amp type on the Katana captures the massive headroom of Mayer's Two-Rock and Dumble setup, so gain is kept low at 4. The Squier Affinity Strat's ceramic single-coils run slightly thinner and brighter than Mayer's Custom Shop pickups, so mids are pulled to 4 and bass is boosted to 6 for warm body, while treble sits at 6 for glassy presence. If adding a dedicated Bluesbreaker-style pedal later, keep the Katana clean and let the pedal provide the edge-of-breakup push.

PRO TIPPlay with your thumb and index fingers rather than a pick—Mayer's percussive, fleshy fingerstyle attack is the true secret to the round low-end bloom on 'Gravity'.

Get this tone on your amp

These settings are for a Boss Katana 50 MkII. ToneAdapt matches any song to whatever amp, guitar and pedals you own — first match is free.

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