What Pedals Does Tom Morello Use?
Tom Morello's pedalboard is one of the most deliberately deceptive in rock — a minimal signal chain that produces sounds most listeners assume require extensive processing. The guitar toggle switch, killswitch, and DigiTech Whammy create effects that sound synthesised or DJ-produced; they are all analog performance techniques.
Signal Chain (RATM Era)
Guitar → DigiTech Whammy WH-1 → Dunlop Cry Baby Wah → Boss DD-3 Digital Delay → Marshall JCM800 Channel 1
No overdrive pedals. No distortion pedals. No fuzz. The JCM800 runs on Channel 1 (relatively clean), pushed by heavy picking attack.
Pedal 1: DigiTech Whammy WH-1 (Original)
The most important effect in Morello's arsenal.
The DigiTech Whammy is a pitch-shifting pedal controlled by an expression pedal — toe down engages the shift, heel down returns to bypass.
Key settings:
"Killing in the Name" / Turntable scratch sound
- Mode: +2 Octave (up two full octaves when engaged)
- The rapid toe-down/heel-up rocking motion while fretboard tapping = turntable scratch imitation
- Combined with left-hand fretboard tapping at the upper frets, the Whammy creates the inhuman "scratching" sound
"Guerrilla Radio" / "Bombtrack" power shifts
- Mode: +1 Octave or Harmony +5th
- Sustained held position creates orchestral pitch layering over the rhythm guitar
Dive effects
- Mode: -2 Octave or Whammy (full dive from unison to 2 octaves below)
Model Note: Morello originally used the WH-1 (first production Whammy) — the tracking and character is slightly different from later versions. The current DigiTech Whammy 5 or DigiTech Drop are the available modern equivalents.
Pedal 2: Dunlop Cry Baby Wah (GCB95)
Used for filtered wah effects in:
- "Bulls on Parade" — the wah-rhythm guitar sound at the intro
- Various outro and fill passages throughout RATM recordings
Morello uses the wah as a filter device, sweeping rhythmically rather than in the conventional rock-lead style. He often parks the wah at a specific position for a vowel-quality tone rather than sweeping it.
Pedal 3: Boss DD-3 Digital Delay
Time: Set to match song tempo (quarter note or dotted eighth)
Feedback: 2–4 repeats
Level: Lower than dry signal
The DD-3 provides the slapback and echo textures in his playing. Less prominent than the Whammy in defining his signature sound, but present for depth and dimension.
Audioslave Era Additions
With Audioslave (2001–2007), Morello's rig expanded slightly:
- Dunlop ZW-45 Wah (additional wah for different character)
- Boss BF-2 Flanger (for specific Audioslave studio sounds)
- EHX Micro Synth (used occasionally for synth-like textures)
The JCM800 remained primary, with the addition of Mesa/Boogie for some contexts.
Guitar Toggle Switch and Killswitch
These are not pedals, but they function as effects in Morello's playing:
Toggle Switch Technique
Rapidly switching the pickup selector switch between neck and bridge positions creates a "scratching" sound — similar to the Whammy scratch but with a different harmonic character. Morello uses this for rhythmic subdivision effects.
Killswitch
A momentary switch wired to cut all guitar signal. Rapid pressing creates the stutter/chop effect:
- "Killing in the Name" main riff uses killswitch for rhythmic chops
- Timed to the song's tempo
What Morello Does Not Use
- Overdrive or distortion pedals — no OD in the RATM chain
- Reverb — the JCM800 room character provides natural ambience
- Chorus or modulation (RATM era) — the Flanger appears in Audioslave only
- Noise gate (despite very high JCM800 volume) — the natural amp's gate character is sufficient
Budget Replication
Essential:
- DigiTech Whammy 5 (~$130): Current production version, closest to WH-1 in functionality
- Dunlop Cry Baby GCB95 (~$80): Standard wah
Optional: 3. Boss DD-3 or Boss DD-8 (~$100): For delay texture 4. The Killswitch: Any luthier can wire a momentary switch for ~$50; alternatively, a volume pedal tapped rapidly achieves similar results
Why "No Distortion Pedals" Is the Most Important Fact Here
It's genuinely surprising to most players that one of rock's most sonically extreme guitarists uses no overdrive, distortion, or fuzz at all — every dramatic texture in his sound comes from pitch manipulation (the Whammy), filtering (the wah), and physical signal interruption (the killswitch and toggle switch) layered on top of a relatively clean amp channel. This is a fundamentally different approach from every other artist rig on this site, where gain and saturation are central to the tonal identity. Morello's sounds are dramatic because of what is happening to the signal, not because the signal itself is heavily distorted.
This matters enormously for anyone trying to replicate his sound: adding an overdrive or distortion pedal to make the effects "sound heavier" actually moves away from the actual technique, which relies on the contrast between a relatively clean foundational tone and dramatic pitch/filter manipulation on top of it.
Common Mistakes
Adding an overdrive or distortion pedal for extra weight. As explained above, this is the single most common misunderstanding of Morello's rig — his dramatic sound comes entirely from signal manipulation techniques on a relatively clean amp, not from heavy gain.
Treating the Whammy as a simple special-effects pedal for occasional use. As the guide shows across "Killing in the Name," "Bombtrack," and "Calm Like a Bomb," the Whammy in different modes is central to multiple entirely different songs' core guitar sound — it's closer to a primary voice than an occasional color.
Assuming the killswitch effect requires expensive custom guitar modification. As the guide notes, any guitar can have a momentary killswitch wired in by a luthier relatively affordably, and a volume pedal tapped rapidly achieves a similar practical result without any guitar modification at all.
Using the wah in a conventional lead-sweep style for "Bulls on Parade." As the FAQ below explains, Morello's wah use there is rhythmic filtering timed to the groove, not the pitch-expressive sweeping typical of blues-rock lead wah technique — a different application entirely.
ToneStakr's Take
For players building this rig, the Whammy pedal is unambiguously the highest-priority purchase — it's doing more identifiable work across Morello's catalog than any other single component, including the amp itself. Resist the urge to add gain pedals to compensate for the relatively clean JCM800 tone; that clean foundation is precisely what makes the pitch and filter manipulation techniques audible and dramatic rather than buried in distortion.
Frequently Asked Questions
What is the DigiTech Whammy mode for "Killing in the Name"?
+2 Octave mode, shifting the pitch up two full octaves when the expression pedal's toe is pressed down. Combined with left-hand fretboard tapping at the upper frets, this creates the distinctive turntable-scratch imitation heard throughout the track.
Does Morello use overdrive pedals?
No — the Marshall JCM800 runs on a relatively clean Channel 1 throughout the RATM era, with all apparent distortion coming from heavy picking attack pushing the amp into mild natural saturation, not from any gain pedal in the chain.
How is the wah used on "Bulls on Parade"?
As a rhythmic filter moved in time with the song's groove, rather than the conventional pitch-expressive lead-sweep style most blues-rock players use. It's a percussive, rhythm-section-adjacent application of the pedal rather than a melodic one.
What original Whammy model did Morello use?
The DigiTech WH-1, the original production Whammy from the early 1990s, which has a slightly different tracking character than later versions. These appear occasionally on the used market; the current DigiTech Whammy 5 is the practical modern equivalent for most players.
Can I replicate the killswitch effect without modifying my guitar?
Yes — a volume pedal tapped rapidly with your foot achieves a comparable stuttering effect without any guitar modification. For a more authentic approach, any luthier can wire a genuine momentary killswitch into most guitars for a relatively modest cost.
Is the toggle switch "scratching" technique difficult to learn?
It requires real practice but isn't technically complex — rapidly flipping a standard pickup selector switch back and forth between two positions while picking creates the rhythmic subdivision effect. The challenge is timing and consistency rather than any unusual physical technique.