Mono Synth Guitar Synthesizer


The EHX Mono Synth transforms your guitar into eleven great sounding synthesizers… from vintage synth emulations to fat, stacked voices to soaring lead sounds and more.

The Mono Synth was designed to work on guitar without any modifications, special pickups or MIDI implementation. Its intuitive layout makes it easy to use and easy to dial in cool sounds quickly. The pedal’s DRY dial adjusts the dry guitar volume at the Synth Output while SYNTH controls the volume of the synthesizer sound at the Synth Output. Used together they let you create just the right mix. The SENS control, short for sensitivity, adjusts how playing dynamics trigger the synthesizer and allows you to fine-tune the pedal’s response to your guitar and playing style.

With the CTRL knob you can adjust a key parameter for each of the eleven synth types. It varies depending on the preset and provides extra tweakability for customizing your sound. There’s also an EXP input which lets you control an entirely different parameter in real-time with an expression pedal!



Using the built-in Preset footswitch, a user customizable preset for each of the eleven synth sounds can be created, saved and recalled. The factory presets are also easy to restore should you wish to.

From string-like synths, to aggressive resonant sounds and deep drones and bell-like tones, the Mono Synth puts a collection of hot synthesizers at your fingertips.

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Quick Specs
- Features eleven great sounding, mono synth sounds
- Easy to use controls let you dial in the sound you want quickly
- EXP pedal input for real-time expressive control with your foot
- Create, save and recall eleven user presets, one for each of the eleven synth sounds
- EHX 9.6VDC-200mA power supply included
- Current Draw: 125mA @ 9VDC
- Dimensions in inches: 4.0(w) x 4.75(l) x 2.25(h)
- Dimensions in mm: 102(w) x 121(l) x 58(h)
From the Blog
Posted 2/12/2019


EHX unveils the Mono Synth which transforms a guitar into 11 different synthesizers… from vintage synth emulations to fat, stacked voices to soaring lead synth sounds and more.


The Mono Synth was designed to work on guitar without any modifications, special pickups or MIDI implementation. Its intuitive layout makes it user friendly. The pedal’s DRY dial adjusts the dry guitar volume at the Synth Output while SYNTH controls the volume of the synthesizer sound at the Synth Output. Used together they let a player fine tune their mix. The SENS control, short for sensitivity, adjusts how playing dynamics trigger the synthesizer and tailors the pedal’s response to the guitarist’s instrument and playing style.

A key parameter for each of the 11 synth types can be adjusted via the CTRL knob. It varies depending on the preset and provides enhanced “tweakability.” There is also an EXP input that lets the player control an entirely different parameter in real-time with an expression pedal.

EHX Founder, Mike Matthews, stated: “From string-like synths, to aggressive resonant sounds and deep drones and bell-like tones, the Mono Synth puts a collection of hot synthesizers at your fingertips.”

The Mono Synth comes equipped with an EHX 9.6DC-200mA power supply and is available now at authorized EHX dealers.

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Show your colors with genuine EHX tee shirts and authentic Electro-Harmonix accessories!
Get this limited-edition Day-Glo poster of the original 1968 art that inspired the Electro-Harmonix logo!

Mike Matthews stated: “The image on our Flashback Poster is of the original artwork that inspired the famous Electro-Harmonix logo. I think players who dig our pedals will also enjoy the chance to own a piece of EHX memorabilia.”
Did you know that Electro-Harmonix makes many of the world's greatest vacuum tubes? The next time you need to re-tube your guitar, bass, or hi-fi amp, be sure to insist on getting authentic Electro-Harmonix tubes.
Our new EHX Strings Electro-Harmonix electric guitar strings are custom-designed to our specifications and made in the USA by a premiere string manufacturer. Each wound string is precision wrapped with round nickel-plated steel onto a high carbon, hexagon-shaped steel core. The plain strings are made from the same high carbon steel as the hex cores. The high quality steel and computer controlled winding process results in strings that intonate accurately, are better at staying in tune and vibrate evenly for maximum sustain.
Dig it, now you can rock EHX in our new heavy-duty black hoodie! It’s emblazoned with the iconic Electro-Harmonix Flashback logo in white on the left chest and back.