How to Sound Like Tom Morello — RATM & Audioslave Tone Guide
Tom Morello is probably the most technically innovative guitarist of the last thirty years. Not in the traditional sense — he is not a virtuoso in the shred tradition. His innovation was conceptual: he looked at the guitar and asked what it could do that it had never done before, and then built a technique around those possibilities.
The result is a body of work where the guitar imitates DJ turntables, helicopter rotors, synthesisers, and human voices — using entirely analogue hardware with no samples, no MIDI, and no digital manipulation beyond the DigiTech Whammy. Understanding his setup is only half the picture. The technique is equally important and in some ways more distinctive.
Background: Classical Training Meets Punk
Morello studied political science at Harvard (graduating in 1986) before moving to Los Angeles to pursue music. Before forming Rage Against the Machine, he played in Lock Up, a heavy metal band with a more conventional approach. What distinguishes RATM is the fusion of heavy, riff-driven metal guitar with the rhythmic sensibility of hip-hop — specifically the turntable manipulation of DJ culture.
Morello's guitar "scratching" is not a sample or a digital effect. It is the physical action of moving the guitar's toggle switch in rhythm while muting strings against the fret board, in combination with the Whammy pedal, to produce a pitch-warped, rhythmically phrased sound that mimics a record being moved back and forth under a stylus.
The Guitars
"Arm the Homeless" Custom Guitar
Morello's primary guitar for most of Rage Against the Machine's career is a custom-built instrument made from various parts. The body was originally a Stratocaster-style body (repainted and modified extensively). The headstock reads "ARM THE HOMELESS" — a political statement typical of Morello's approach.
Key specifications:
- Body: Partscaster (Strat-style body, heavily modified)
- Pickups: Seymour Duncan JB (bridge) and Seymour Duncan Custom Custom (neck)
- Kill switch: A dedicated on/off switch wired in parallel — when engaged, it instantly cuts the signal. This is how Morello produces his rhythmic "chucking" sounds — rapid on/off signal cutting in tempo
- Toggle switch modification: The standard pickup selector toggle is used aggressively as a rhythm tool, switched rapidly between positions to create the DJ-scratch effect
1978 Gibson Les Paul Custom
Used on many recordings and live performances, particularly from the Audioslave era. The Les Paul Custom provides a fuller, warmer character than the Arm the Homeless guitar, with humbuckers that have less high-frequency content and more thickness.
The Les Paul is important for the Audioslave sound — the Chris Cornell vocal register demanded a somewhat fuller guitar character, and the Les Paul's warmth sits better in that context than the more aggressive Partscaster.
Fender Stratocaster (various)
Used on specific tracks and for cleaner passages. The Strat's single-coil bridge pickup character appears on some of Morello's melodic playing, particularly in Audioslave's more expansive material.
For recreation: A Humbucker-equipped guitar is essential — the JB/Custom combination provides the specific high-output, aggressive character of the Arm the Homeless guitar. Seymour Duncan JB (bridge) at around £80 is the correct pickup. Any guitar with this pickup installed will approach the basic character.
The Amplifier: Marshall JCM800
Morello uses a Marshall JCM800 2203 head into a Marshall 1960A 4×12 cabinet with Celestion Vintage 30 speakers. This is the foundation of the RATM and Audioslave guitar sound.
JCM800 Characteristics
The JCM800 2203 is a single-channel, high-gain Marshall from the early 1980s. It has a specific character:
- Aggressive upper midrange — the JCM800 is known for its cutting, aggressive mids that sit forward in a mix
- Tight low end — compared to a plexi-era Marshall, the JCM800 is tighter and more controlled in the bass frequencies
- High gain — the 2203 can produce significant preamp distortion without pedals, more so than earlier Marshalls
Morello runs the JCM800 at high gain settings — the preamp gain controls are turned up, and the amplifier is doing most of the distortion work. The result is a sound that is dense, aggressive, and midrange-forward.
Amp Settings
Approximate JCM800 settings:
- Preamp Gain: 7–8 (high — the amp is doing the drive)
- Bass: 5–6
- Middle: 7–8 (high mids are central to the RATM character)
- Treble: 6–7
- Presence: 6
- Master Volume: 4–5 (enough for power amp saturation without excessive volume)
The high mid setting is significant — Morello's tone has a pronounced midrange quality that makes it cut through even at loud volumes and in dense mixes. The RATM guitar sits in a specific pocket: heavy and driven but midrange-forward rather than scooped.
For home use: A Marshall DSL40CR or DSL20CR can approximate the JCM800 character at more practical volumes. Use the Crunch channel with gain at 7–8, and emphasise the midrange in the EQ. Alternatively, a Boss Katana with an amp sim set to British high-gain character works well as a practice tool.
The Pedals
Morello's pedal board is notably minimal for the range of sounds he produces. Most of his signature sounds come from technique rather than complex effects.
DigiTech Whammy (WH-1 Original)
The Whammy is probably the most important piece of gear in Morello's signal chain after the amplifier. The original DigiTech Whammy WH-1 (produced in the early 1990s) is specifically what he uses, and the original has a slightly different character from later versions.
What it does: The Whammy pedal uses a pitch-shifting algorithm controlled by an expression pedal. As you rock the pedal forward, the pitch shifts up (1 octave, 2 octaves, or specific intervals depending on the mode setting). As you rock it back, it returns to the original pitch.
How Morello uses it:
- Heel-to-toe pitch sweeps as expressive devices (the dive-bomb effect on "Bulls on Parade")
- Rapid rocking to create a tremolo-pitch effect
- Combined with whammy bar on the guitar to create wider pitch excursions
- Set to specific intervals (octave up, two octaves) for specific riffs
The "Whammy dive": The signature descending sweep at the end of phrases — heel position plays the note at pitch, toe position shifts it an octave up, and the rapid rocking between these produces the characteristic flutter.
Cost: The current DigiTech Whammy 5 (around £130 new) is the closest available equivalent. The WH-1 originals sell for £200–300+ on the used market. The difference in sound between versions is audible but not enormous.
Dunlop Cry Baby Wah (modified)
Morello uses a Dunlop Cry Baby wah modified with a different pot (potentiometer) for a wider sweep range. The standard Cry Baby has a characteristic frequency response that Morello has adjusted to have more control at the heel and toe extremes.
Used for:
- Conventional wah soloing (particularly in Audioslave's more traditional rock contexts)
- Combined with the kill switch for the "wah-scratch" technique
- Parked (left in a fixed position) for a mid-boost character during certain riff sections
MXR Phase 90
The Phase 90 appears throughout RATM and Audioslave for phased rhythm parts and solo passages. The original script logo Phase 90 has a slightly warmer character than the modern block logo version, though both are usable.
Settings: Typically slow to medium speed (8–11 o'clock on the Speed knob). Fast phasing is used occasionally for specific effects.
Boss DD-3 or DD-6 Digital Delay
Used sparingly — delay on specific lead lines, not as a textural element throughout. Short-to-medium delay times for repeating a phrase once or twice.
Talk Box (various)
On "Killing in the Name" and other tracks, Morello uses a Heil Talk Box — a device that routes guitar signal through a tube into the player's mouth, allowing vowel shapes to modulate the sound. It is not a voice synthesiser; the guitar signal is filtered by the musician's mouth forming different vowel sounds, which the microphone captures.
Setup: Talk box requires a dedicated power amp (the talk box takes a full-power signal), a tube running from the driver unit into your mouth, and a microphone to capture the modulated output. It is not a simple plug-and-play device — proper setup takes some work.
The Technique: What the Gear Can't Do Alone
The Kill Switch
The kill switch — a normally-closed switch wired in parallel with the output that shorts the signal to ground when pressed — is one of Morello's signature tools. Rapid pressing in rhythm creates the percussive "machine gun" effect on songs like "Bulls on Parade."
How to replicate without a custom switch: The guitar's volume control turned rapidly to zero and back is a slow approximation. A proper kill switch requires either modification or a guitar equipped with one. Some guitars (Gretsch models, some Guild models) have kill switches standard.
DIY option: A simple SPST momentary switch can be wired into a guitar's output circuit for around £10–20 in parts if you're comfortable with basic soldering.
Toggle Switch Manipulation
The pickup selector toggle switch, moved rapidly between positions, creates a stuttering on/off effect (not identical to a kill switch — the volume between positions is not always zero — but effective when done fast). This is how Morello creates the "scratching" sounds: toggle moved rhythmically while muting strings against the fretboard.
The muting is critical. The strings must be muted so they don't ring, but lightly enough that they still create some scratch-like noise when the pick contacts them while toggling.
The "Helicopter" Effect
One of Morello's most distinctive sounds is the helicopter-rotor-like rapid pitch oscillation. This combines:
- Depressing the whammy bar to a specific position
- Picking and muting strings near the bridge
- Moving the Whammy pedal rapidly
- Toggling between pickups
The result is a sound that legitimately sounds like rotor blades — a pitch warbling at multiple rates simultaneously. It cannot be reproduced by any single effect; it is the combination of mechanical, electronic, and technique elements.
Era-by-Era Breakdown
Rage Against the Machine (1992–2000)
The RATM sound is heavy, midrange-aggressive, and dense. The JCM800 is run hard, the kill switch technique is prominent, and the Whammy is used as a rhythmic instrument.
Key songs:
- "Killing in the Name" — JCM800 crunch, minimal effects, talk box on the intro
- "Bulls on Parade" — Whammy dive sweeps, heavy rhythm, kill switch technique on the main riff
- "Guerrilla Radio" — Tight, punchy JCM800 rhythm
Audioslave (2001–2007)
Slightly warmer and more traditional rock. The Les Paul appears more, the tone is less aggressively scooped, and Morello incorporates more conventional lead guitar alongside his signature sounds.
Key songs:
- "Like a Stone" — More restrained, clean and driven, Les Paul character
- "Cochise" — Heavy riffing with Whammy and Phase 90
- "Show Me How to Live" — Aggressive rhythm, RATM-adjacent
The Nightwatchman / Solo (2007–present)
Acoustic, political folk music. Entirely different sonic territory — relevant only for acoustic tone, which is not covered here.
Budget Recreation Setups
Under £300 — Core Technique Practice
- Guitar: Any humbucker-equipped guitar
- Pedal: DigiTech Whammy 5 (£130)
- Amp: Any medium-gain amp, driven hard
Kill switch: wire one into your guitar (£10 in parts). This is the most important addition.
£300–600 — Real Setup
- Guitar: Epiphone Les Paul Standard (£350) with Seymour Duncan JB installed (£80)
- Pedals: DigiTech Whammy 5 (£130) + MXR Phase 90 (£75) + Dunlop Cry Baby (£80)
- Amp: Marshall DSL20HR head (£530) into a small 2×12 cabinet
£600–1,200 — Close to Authentic
- Guitar: Gibson Les Paul Standard '60s (£1,850) or a well-modified Strat with JB installed
- Pedals: DigiTech Whammy 5 (£130) + MXR Phase 90 (£75) + Dunlop modified Cry Baby (£100) + Boss DD-3 (£100)
- Amp: Marshall JCM800 reissue (£1,400) or Marshall DSL100HR (£900) into Marshall 1960A cabinet (£450)
Frequently Asked Questions
What amplifier does Tom Morello use? Marshall JCM800 2203 head into a Marshall 1960A 4×12 cabinet with Celestion Vintage 30 speakers. He runs it at high gain with the preamp heavily driven.
What is the Whammy pedal Tom Morello uses? The original DigiTech Whammy WH-1 from the early 1990s. Current production equivalents are the DigiTech Whammy 5 (around £130) and the DigiTech Whammy DT (adds tuning capability, around £180).
How does Tom Morello make the scratching sound? The "turntable scratch" is created by: (1) muting strings near the bridge, (2) rapidly toggling the pickup selector switch in rhythm, and (3) using the Whammy pedal for pitch variation. No digital samples or processing — it is entirely physical technique.
What guitar pickups does Tom Morello use? Seymour Duncan JB (bridge) and Seymour Duncan Custom Custom (neck) in his primary Arm the Homeless guitar.
Can I replicate Morello's tone with a solid-state amp? Partially. The Whammy-based techniques and kill switch effects are independent of the amplifier. The JCM800 midrange character is harder to achieve without a British tube amplifier — a Boss Katana on the Crunch voice with mids emphasised is a workable practice alternative.
What makes Tom Morello's playing unique? The combination of conventional heavy guitar technique (power chords, riffing) with DJ-derived turntable manipulation techniques applied to guitar hardware. His solos are not scales or arpeggios — they are rhythmically controlled sound design using the guitar as a noise-making machine.