The polyphonic SUPEREGO Synth Engine reinvents sample and hold, performs fluid glissandos and creates oscillator like, synthesizer effects. It can stack sounds or create infinite sustain, it even lets you tweak attack and decay, or use its effects loop to invent novel synth patches. Indulge your guilty pleasures!

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Quick Specs

Auto mode captures and freezes notes and chords as you play Controllable glissando Sustain notes and chords as long as wanted Insert effects into the wet signal with the effects loop Latch mode with a layer feature to stacksounds 9 Volt power supply provided Dimensions in inches: 4.0 (w) x 4.75 (l) x 2.25 (h) Dimensions in mm: 102 (w) x 121 (l) x 89 (h)

From the Blog

Posted 6/10/2020

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Mike Matthews says: “Dig it! Some people think of effects pedals as the sole domain of guitarists and bassists. Actually, players of most instruments can and do use pedals to expand their expressive capabilities and discover inspiring new sounds.



We’ve picked half a dozen of our favorite non-guitar/bass examples that people have sent us: two on sax, two with trombone and a couple with violin. Enjoy! And if you have a cool video of an EHX pedal being used on brass, woodwinds, strings, etc., send it in. We just might post it.”



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Mike Matthews says: “Dig it! Some people think of effects pedals as the sole domain of guitarists and bassists. Actually, players of most instruments can and do use pedals to expand their expressive capabilities and discover inspiring new sounds.We’ve picked half a dozen of our favorite non-guitar/bass examples that people have sent us: two on sax, two with trombone and a couple with violin. Enjoy! And if you have a cool video of an EHX pedal being used on brass, woodwinds, strings, etc., send it in. We just might post it.”Watch now » www.ehx.com/dig-it

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From the Blog

Posted 5/21/2015

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From the Blog

Posted 7/11/2014

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From the Blog

Posted 3/28/2014

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This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.



Ryan Kiesshauer does a great job of showing off and explaining what the EHX Superego is capable of.

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From the Blog

Posted 3/24/2014

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From the Blog

Posted 1/14/2014

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Joel Bauman improv using the





This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.



Joel Bauman improv using the Superego Synth Engine at Chicago Music Exchange

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From the Blog

Posted 10/16/2013

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Cosmogang takes his turn at tweaking the EHX





Cosmogang takes his turn at tweaking the EHX Superego into ambient territories.

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From the Blog

Posted 9/12/2013

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Tony Grey demos the

For more on Tony check out





This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.







Tony Grey demos the Superego Synth Engine with bass guitar. Tony is set to release his fourth solo album, Elevation, on October 15 2013. It’s a collaboration featuring the amazing Mike Stern, fretless guitar legend David Fiuczynski, Whitesnake’s Reb Beach, Japanese star Hotei Tomoyasu and Tony’s guitar-legend uncle, John McLaughlin.For more on Tony check out http://tonygrey.com/category/tony-grey-bass-academy

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From the Blog

Posted 9/6/2013

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Tubescreamer creates “Dark Orchestra Sounds” with the EHX





Tubescreamer creates “Dark Orchestra Sounds” with the EHX Superego Synth Engine

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From the Blog

Posted 6/6/2013

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MusicToyz demos the EHX



This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.



MusicToyz demos the EHX Superego Synth Engine.

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From the Blog

Posted 6/4/2013

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Modern horn players are embracing the way effects pedals help them expand the boundaries of their axes. Whether it’s turning a tenor sax into a baritone, empowering a trombone to play chords, or enabling horn players to create avant-garde soundscapes that were once beyond their reach, EHX is at the fore of this innovation.



Here, saxophonist Geoff Countryman and trombonist Rick Parker explore how the EHX









These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.



Modern horn players are embracing the way effects pedals help them expand the boundaries of their axes. Whether it’s turning a tenor sax into a baritone, empowering a trombone to play chords, or enabling horn players to create avant-garde soundscapes that were once beyond their reach, EHX is at the fore of this innovation.Here, saxophonist Geoff Countryman and trombonist Rick Parker explore how the EHX H.O.G.2 Ring Thing and Superego Synth Engine open new doors for the creative horn player.

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From the Blog

Posted 5/31/2013

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DoVira is a modern Ukrainian band. Guitarist Patrick O’Reilly wrote to tell us they used an EHX







DoVira is a modern Ukrainian band. Guitarist Patrick O’Reilly wrote to tell us they used an EHX Superego Synth Engine (especially the Glissando function for synth-like pads), a Holy Grail reverb and the Ravish Sitar on bass (as a drone) while recording this song.

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From the Blog

Posted 5/3/2013

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The legendary Adrian Belew gets his first taste of the EHX Superego Synth Engine. Here’s a quick video he sent Mike Matthews. This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

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From the Blog

Posted 4/24/2013

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Mike Hermans at Prymaxevintage demos the Superego Synth Engine. This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

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From the Blog

Posted 4/12/2013

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The Superego Synth Engine is hot and has been embraced by adventurous guitarists and reviewers alike. In their current issue, Vintage Guitar magazine writes that it’s a “great tool for experimenting with synth sounds and textures.” Iheartguitarblog.com says, “the best way to think of the Superego is as a component that converts part of your guitar sound into a waveform that can be twisted and manipulated in a similar way to an analog synth.” If you haven’t seen or heard the Superego Synth Engine, check out this quick Video by Bill Ruppert of Effectology fame. Click for iheartguitarblog.com review Click for Vintage Guitar review

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From the Blog

Posted 3/28/2013

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Can you use some inspiration? The Superego Synth Engine opens doors for creative guitarists. Capture and hold notes or chords, perform fluid glissandos and unleash oscillator-like synthesizer effects. Layer sounds, create infinite sustain, tweak attack and decay, or use the effects loop to invent your own signature sounds. Take a quick trip as “JJ Likes Guitar” demos the key features of this award-winning pedal. This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

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From the Blog

Posted 1/17/2013

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The 2013 Electronic Musician Editors’ Choice Awards were just announced and the EHX Superego Synth Engine copped one. The polyphonic Superego reinvents sample and hold, performs fluid glissandos and unleashes oscillator-like synth effects. Layer sounds, create infinite sustain, tweak attack and decay, or use its effects loop to invent your own unique synth patches. Three modes of operation: Auto, Manual and Latch, let you indulge your guilty pleasures! Click here to read the review

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From the Blog

Posted 12/19/2012

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From the Blog

Posted 12/7/2012

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LucianHarke creates soundscapes with the EHX Superego Synth Engine.

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From the Blog

Posted 12/4/2012

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From the Blog

Posted 11/16/2012

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Guitar World says: “The Electro-Harmonix Superego provides a lifetime of inspiration, exploration and truly musical effects for guitarists who want to boldly expand the sonic capabilities of their instruments beyond traditional sounds.” Read the entire review here

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From the Blog

Posted 11/5/2012

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From the Blog

Posted 11/2/2012

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From the Blog

Posted 10/22/2012

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The New Yorker noted that, “Bill Frisell plays the guitar like Miles Davis played the trumpet: in the hands of such radical thinkers, their instruments simply become different animals. And, like Davis, Frisell loves to have a lot of legroom when he improvises—the space that terrifies others quickens his blood.” An avowed sonic experimentalist, this quick clip (by Monica Frisell) shows the poll winning guitarist “messing around” with his brand new EHX Superego Synth Engine. Click here to view the video

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From the Blog

Posted 10/10/2012

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Sweetwater’s, Daniel Fisher, gives an excellent guided tour of the new EHX Superego Synth Engine using both guitar and keyboard.

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From the Blog

Posted 10/5/2012

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“If you’re a dedicated tone explorer and texturalist, you’d be silly to pass this pedal up. And if you savor the art of transforming your guitar entirely, the Superego is an amazing place to start.” Click here to read the review

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From the Blog

Posted 9/25/2012

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The UK’s Bass Guitar magazine asks: “Want to scare people with your bass? Of course you do. Joel McIver road-tests EHX’s new Superego Synth Engine and terrifies the neighbours.” Click here to read the review

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From the Blog

Posted 9/19/2012

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From the Blog

Posted 9/18/2012

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We are very pleased to inform you that Mike Matthews has been nominated for Vintage Guitar Magazine’s Hall of Fame. The category is “Innovators” and this is an unabashed solicitation for you to cast your vote for Mike, a guy who truly is one of the most innovative characters in the music equipment biz. A hollow boast? Hardly! Here is a short list of just some of the innovations Mike Matthews has been responsible for in his career at the helm of Electro-Harmonix: First product to introduce the age of overdrive: LPB-1 Linear Power Booster

First portable, battery powered, guitar amp; Freedom Amp

First to introduce feedback with a phase shifter: Bad Stone

First electronic flanger: Electric Mistress

First with an analog delay: Memory Man

First inexpensive digital delay: 2 Second Digital Delay

First to pioneer an electronic looper: the 16 Second Digital Delay

First to introduce inexpensive sampling: Instant Replay, then the Super Replay In Mike’s 45 year history of relentless product innovation, he’s also been responsible for iconic effects pedals like the Big Muff Pi and the POG2 Polyphonic Octave Generator. More recently, he continues to redefine the landscape of effects with products like the Freeze Sustainer, Ravish Sitar Pedal, Superego Synth Engine and the ground-breaking Crying Tone Wah Pedal with no moving parts. His successful battles against violent Russian mobsters only spiked his creativity! Voting is easy. Just go to http://www.vintageguitar.com/hall-of-fame/

Log in and cast your vote. Oh, there’s an added benefit to you. Voters are entered to win a beautiful new D’Angelico guitar, so do it now! And many thanks for your support.

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From the Blog

Posted 8/21/2012

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“I was amazed how quickly and easily it was to create an ambient, atmospheric wall of sound” says Sam Davis of GuitarJar.com. Click here to read the rest of this great review here

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From the Blog

Posted 8/17/2012

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The people from Presonus stop by the EHX booth in Nashville at Summer NAMM 2012.

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From the Blog

Posted 8/10/2012

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Lee from Absolute Music in Bath, UK gave the Superego an in-depth write-up and shot a demo of just a few things this powerhouse of a pedal is capable of. Read the entire review here

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From the Blog

Posted 7/24/2012

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Harmony Central stopped by the Electro-Harmonix display at Summer NAMM in Nashville to check out all the latest EHX gear.

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From the Blog

Posted 7/20/2012

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The Boston Globe calls Thaddeus Hogarth a “Guitar Virtuoso.” Thaddeus calls the new Superego guitar pedal “an extension of my instrument.” Read it all here.

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From the Blog

Posted 6/14/2012

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Andy at Pro Guitar Shop explores the new EHX Superego Synth Engine. This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

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From the Blog

Posted 5/29/2012

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danieldangerously does a quick demo of the Superego glissando function on bass guitar.

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