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Electro-Harmonix XO Worm Analog Modulation Multi Effects Pedal

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The Electro-Harmonix Worm is a guitar effects pedal with an all-analog multi-effects processor featuring Phaser, Tremolo, Vibrato, and a Neo-modulated Wah. At the heart of The Worm is a specially desi... Read More

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The Electro-Harmonix Worm is a guitar effects pedal with an all-analog multi-effects processor featuring Phaser, Tremolo, Vibrato, and a Neo-modulated Wah. At the heart of The Worm is a specially designed tone-bending engine that creates groundbreaking oscillatory effects.

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  • True bypass
  • Mode-selectable analog modulation effects: wah, phaser, vibrato, tremolo
  • Manual mode removes the modulation so the effects can be swept by hand
  • Optional expression pedal sweep capability
  • Tough and compact die-cast chassis
One year warranty on pedals. 90 day warranty on all other products.

  • Customer Reviews


by PowerReviews

(based on 5 reviews)

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Reviewed by 5 customers

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Great addition to the pedalboard!


from Portland, OR

I tried this one out at my local Guitar Center. This thing sounds killer. I really like the fact that it has 4 modes to choose from and they all sound sweet in their own way. It's like 4 pedals in one. Get it, you won't be sorry. I did and I'm not.

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Warm and retro-sounding

By Charles Stellmon

from Seattle, WA

I like the wah and phaser sounds on this pedal, they have a nice retro vibe that sounds amazing with my Fuzz Factory. Using an expression pedal with the wah and phaser sound is a blast as well, I prefer the sounds to my base model Crybaby. This pedal is "noisy" in the same way a wah pedal is; when you are not playing with the pedal on, you can slightly hear it modulating in the background (in auto mode on wah or pahser). Digging the wah and phaser sounds on this pedal and how it sounds with fuzz, makes this an excellent value for me. Thoroughly stoked to play this.

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(1 of 1 customers found this review helpful)


Good value - worth buying

By HawthornHolly

from Charlotte, NC

I have owned this pedal for about 2 years, and it is a really good value for the money. Having four effects in one is awesome, the downside being that you have to manually switch between them with the knob. An option to cycle through them on the fly would have been nice. You can plug in an expression pedal and use it with the wah effect, making it a full blown wah pedal, or you can get various other tones by using it with the other effects. The expression pedal basically adjusts the amount of "range" rather than using the same knob on the pedal. My biggest gripe is that when it is engaged, there is a significant boost to your volume, which depending on the situation can be a bad thing. I broke most logical pedal arrangement convention and actually put this BEFORE my compression pedal, which keeps the volume level in check. The effects can be somewhat subtle, so if you are looking for some uber-major modulation effects then you might want to look elsewhere. Other than that, it is a great pedal and being able to use it with an expression pedal as a bonus makes this one of my favorite pedals! If you can look past its few short comings, then this is a must buy!

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(5 of 8 customers found this review helpful)


very good!!!!

By paul

from texas

I was seeking a quiet, small, multi-purpose pedal which would provide trem, auto-wah, and phasing. (I don't generally have a need for vibrato or pedal-wah in my playing.) After playing with Mister Worm for about 20 minutes in the store, I brought it home, and to date have played 3 gigs and numerous rehearsals and jams with it. It is tremendously-easy to get decent sounds out of it. The manual is beyond worthless, but seriously, if you can't figure this pedal out on its own, you should take a break and have a few beers. When you return, it'll be much more clear. I have a huge selection of guitars, plus the electric dulcimer, mandolin, and bouzouki... all run through either my Behringer 15W or Yamaha G100-212 amps. The Worm is dead silent - adds no noise at all, and has True Bypass - yeay! - no tone-sucking. "UNKNOWN's" review chastized the Worm for... I guess... not being "severe" or "prominent" enough. They have a point here - this pedal will NOT get you into sonic mayhem territory. Persomally, I like that. I don't need to go there. It's enough for me to know that no matter how I tweak the knobs with my size-12's while onstage, I won't get too-far afield from the core sound I'm after. So, that's either a plus or a minus, depending on what you're trying to accomplish. The Auto-wah is pretty anemic (even the nasty noisy Boss pedal is more prominent), but on the other hand, ALL of the Worms' sounds are quiet, pretty, and well-restrained. My gear moves a LOT. If a device doesn't make the grade, it's gone without a second thought. Based on my short experience with Mister Worm, I intend to keep it a long time. I love the fact that it's "tame" (again, this might really annoy others). If I need more, I'll fire up the Eventide. I love the fact that Mister Worm packs so many options into such a small box, which doesn't consume undue real-estate on my board. I love the fact that it's deadly-silent when I'm not actually playing, and has true bypass. I love the fact that it's made in New York City - because I love NY and its people. I wish it had just a bit more aggression in the Auto-wah... but that's a small gripe. It helps me make music by being so jolly and unobtrusive. The settings are straightforward, no menus, no presets, no scrolling, no tedious programming when my band is otherwise ready to rock. Because it's "tame", even if I forget to switch the settings (for whatever song we're on), it still makes a very nice sound which serves until I have enough of a vocal break (I'm lead vox, too) to reach down and flop the settings to where I should've set them - that's a beer thing. Go play one. It's perfect for some - like me, maybe not for others. I have NO hesitation recommending it, but whether you like it or not depends on what your Muse is whispering in your ear.

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(1 of 6 customers found this review helpful)


EHX you do it again!

By Roberto Zavala

from brownsville, tx

really vintage and analog sounds, like at the individual stompboxes

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