Pricing and availability
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Price
Average Price: $132
Budget/Beginner
$150
$601+
Price Tier
Budget
Standard
High-end
Price History
Based on price data from 2 merchants for "Electro-Harmonix XO The Worm". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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Description
Unleash the power of your guitar with the Electro-Harmonix XO The Worm, an all-analog multi-effects guitar pedal designed to redefine your soundscapes. This compact pedal is packed with Phaser, Tremolo, Vibrato, and Neo-modulated Wah, providing a rich palette of tonal colors to bring your music to life. At the core of The Worm is a specially designed sound modulator, a tone-bending engine that produces groundbreaking oscillatory effects. This powerhouse of creativity is super intuitive to use, allowing you to dial in your desired sound with ease. Whether you're crafting ethereal soundscapes or adding a touch of magic to your solos, the Electro-Harmonix XO The Worm is your ticket to sonic adventure.
Key Features:
- Fully analog multi-effect processor featuring Phaser, Tremolo, Vibrato, and Neo-modulated Wah.
- Powered by a specially designed sound modulator that produces oscillating effects.
- Controls include Rate and Range.
- Hand switch options: Auto/Manual Exp, Mode.
- LED indicates Effect On/Off.
- Foot switch for Effect Bypass.
- Connectors: Input (6.3 mm jack), output (6.3 mm jack), expression pedal input (6.3 mm stereo jack), power supply connection (coaxial socket 5.5 x 2.1 mm - positive pole inside).
- Powered by a 24 V DC power supply (included).
- True bypass for preserving signal integrity when not in use.
- Please note: Battery operation not supported.
Owner's manual
Electro-Harmonix XO The Worm User ManualProduct specs
| Effects | tremolo, vibrato, wah, phaser, multi-fx |
| Power | AC |
| Bypass | true bypass |
| Analog/Digital | analog |
Videos
EHX
Electro-Harmonix Worm Analog Wah / Phaser / Vibrato / Tremolo Pedal (Demo by Peter Stroud)
Electro-Harmonix Worm Analog Wah / Phaser / Vibrato / Tremolo Pedal (Demo by Peter Stroud)
EHX
Electro Harmonix Worm
Fuzzville
Electro Harmonix WORM shootout old versus new version
gearmanndude
EHX The Worm in 100 Seconds
docSanchezFX
Electro Harmonix Worm Modulation | Gear4music demo
Gear4music Guitars
Only Every Sound: Electro-Harmonix The Worm Pedal Demo
David Hiemstra Music
Video Manual: Electro Harmonix The Worm
Pedal Experiments
Electro Harmonix: The Worm (modulation pedal). Demo with 'Nose' expression controller
Gearfacts
Reviews
PROS
-
Offers a vintage analog style tone
-
Versatile multi-modulation sampler with options for expression pedal connection
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Unique character and lo-fi charm from modulation modes
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Durable heavy-duty die-cast housing
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Adds depth and "weirdness" to guitar and bass tones
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Auto-wah and phaser functions are well-received
CONS
-
Effects can be subtle, lacking extreme coloration
-
Requires its own 24V power supply, complicating pedalboard integration
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Some functions (tremolo, phaser) lack customization options (wave shape, stages)
-
Rate knob's usable range is limited; gets too fast too early
-
Generates noise, particularly in certain setups or with high-output instruments
-
Tone changes noticeably between effects, with some boosting treble excessively
Owner Insights
We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Electro-Harmonix XO The Worm.
Setup and maintenance
-
The Worm requires a 24V power supply, but can be powered with a 12V supply using a Truetone 1 SPOT TVD voltage doubler and CL6 Converter.
Source
Features and functionality
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The rate knob is reportedly difficult to dial in precisely, affecting the overall usability for some users.
Source -
The Worm's tremolo is more akin to a univibe, while its vibrato functions as a tremolo, offering a unique tonal coloring.
Source -
Line 6 M5 is a recommended alternative for its simplicity in setting up presets and a wide range of modulation and delay effects.
Source
User experience
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One owner finds The Worm to be the least used pedal on their board due to its challenging controls.
Source
Comparisons
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The Nux Mod Force is suggested as an alternative, offering all conventional sounds with great quality despite a cheap exterior.
Source
4.0 out of 5
Based on 4 Reviews and 25 Ratings
165
Cheap, versatile and good sounding
Great pedal to give your guitar more "weirdness" or just to make your tone more interesting with vibrato or tremolo option. Phaser sounds good. Didin't use wah tho. The only minus is the need for using the 24v power supply.
126
Perfect for the "Mac DeMarco shimmering vibrato" effect!
I love this pedal, however I wish the range knob worked deeper as a depth knob, and it requires its own power supply, but its very fun!
393
jackknife of modulation
have to watch the input on this one, can distort with a hot signal, the tremolo is the best sound here, followed by the Vibrato, the phazer so so, the wah......combined with my Morley Wah pedal is modulated wah heaven!
Artist usage
Add artist
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In an Instagram post by Lee Kiernan, the Electro-Harmonix XO The Worm pedal is featured, indicating its use during the recording of the second album.
Naiv studios worked on re-designing Skee Masks's studio space in 2020. Photos taken by Luis Zeno Kuhn of the finished room reveal much of Skee Mask's gear and workspace. The photos were found on the Naiv studios website under the index section that shows work done for previous clients.
In this picture (which I can confirm is Harry's pedalboard), an Electro Harmonix Worm can clearly be seen in the back row.
In an interview with Music Psych he gives a photo of his pedalboard shown above🖖
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Genre Usage
Based on how artists on Equipboard use this gear, it is most commonly found in the following genres.
Used With
Based on how musicians on Equipboard use Electro-Harmonix XO The Worm, it is most commonly used with the following gear.
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Community setups
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