Pricing and availability

We compare 600+ stores and found this item at 10 stores. Prices updated .

Sweetwater
4.0 (12)
$151.50
Guitar Center
5.0 (1)
$151.50
Amazon
3.8 (46)
$151.50
Reverb
4.0 (21)
$108.37 New
$89.00 Used
Thomann
4.1 (79)
$115.00
Gear4Music
£123.25

Average Price: $137

Budget/Beginner

$150

$601+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 8 merchants for "Electro-Harmonix Mono Synth". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

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Description

Introducing the Electro-Harmonix Mono Synth, a versatile guitar pedal designed to transform your guitar into 11 distinct and captivating synthesizers. This pedal offers a range of tones from vintage synth emulations to fat, stacked voices, and soaring lead sounds, all without requiring any modifications, special pickups or MIDI implementation.

The Mono Synth is easy to use, with an intuitive layout that allows you to dial in your desired sound quickly. The DRY and SYNTH dials adjust the dry guitar volume and the volume of the synthesizer sound respectively, allowing you to create the perfect mix. The SENS control, short for sensitivity, adjusts how your playing dynamics trigger the synthesizer, enabling 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. This knob provides additional tweakability for customizing your sound. The pedal also features an EXP input, which lets you control an entirely different parameter in real-time with an expression pedal.

The built-in Preset footswitch allows you to create, save, and recall a customizable preset for each of the eleven synth sounds. 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.

Key Features:

  • Eleven great sounding, mono synth sounds
  • Intuitive layout for quick and easy sound dialing
  • DRY and SYNTH dials to adjust the dry guitar volume and synthesizer sound volume
  • SENS control to adjust how playing dynamics trigger the synthesizer
  • CTRL knob to adjust a key parameter for each of the eleven synth types
  • EXP pedal input for real-time expressive control
  • Built-in Preset footswitch to create, save, and recall eleven user presets
  • Comes equipped with an EHX 9.6DC-200mA power supply

Owner's manual

Electro-Harmonix Mono Synth User Manual

Product specs

Pedal Type Guitar Mono Synth
Analog/Digital Digital
Effects 11 x Mono Synths
Inputs 1 x 1/4"
Outputs 1 x 1/4" (effect), 1 x 1/4" (dry out)
Other I/O 1 x 1/4" (expression)
Bypass Switching Buffered
Power Source 9V DC power supply required (included)
Power Usage 125mA
Height 2.25"
Width 4.0"
Depth 4.75"
Weight 0.7 lbs.

FAQs

What types of sounds can the Electro-Harmonix Mono Synth create?

The Electro-Harmonix Mono Synth offers 11 distinct synth sounds, allowing for a wide range of textures from classic analog synth tones to more experimental sounds, all tailored for guitarists.

Can the Electro-Harmonix Mono Synth be used with a bass guitar?

While primarily designed for electric guitars, the Electro-Harmonix Mono Synth can be used with a bass guitar, though the tracking and sound may vary depending on the bass's frequency range.

Does the Electro-Harmonix Mono Synth require a specific power supply?

Yes, the Electro-Harmonix Mono Synth requires a 9V DC power supply, which is included with the pedal.

How does the expression pedal input enhance the Electro-Harmonix Mono Synth's functionality?

The expression pedal input allows users to control various parameters in real-time, offering dynamic performance possibilities and the ability to shape synth sounds on the fly.

Is the Electro-Harmonix Mono Synth suitable for live performances?

Yes, the Electro-Harmonix Mono Synth is equipped with buffered bypass switching, ensuring consistent performance and minimal signal loss, making it suitable for live settings.

EHX

EHX

Electro-Harmonix Mono Synth Guitar Synthesizer Pedal

Video thumbnail for Electro-Harmonix Mono Synth Guitar Synthesizer Pedal by EHX

Electro-Harmonix Mono Synth Guitar Synthesizer Pedal

EHX

EHX

Video thumbnail for Electro Harmonix Mono Synth - Sound Demo (no talking) by Guitar Bonedo

Electro Harmonix Mono Synth - Sound Demo (no talking)

Guitar Bonedo

Guitar Bonedo

Video thumbnail for Electro-Harmonix MONO SYNTH : Guitar Synthesizer of Coney Island Arcade Love by gearmanndude

Electro-Harmonix MONO SYNTH : Guitar Synthesizer of Coney Island Arcade Love

gearmanndude

gearmanndude

Video thumbnail for Fun Pedal! | Electro-Harmonix  Mono Synth Unboxing and Demo by Perfecto De Castro

Fun Pedal! | Electro-Harmonix Mono Synth Unboxing and Demo

Perfecto De Castro

Perfecto De Castro

Video thumbnail for Electro-Harmonix Mono Synth DEMO by PEDALOGUE

Electro-Harmonix Mono Synth DEMO

PEDALOGUE

PEDALOGUE

Video thumbnail for Electro Harmonix Mono Synth Synthesizer Pedal Demo and Review by The Gear Cage

Electro Harmonix Mono Synth Synthesizer Pedal Demo and Review

The Gear Cage

The Gear Cage

Video thumbnail for EHX Mono Synth Pedal Demo   NO TALKING by Sandy Ridge Music

EHX Mono Synth Pedal Demo NO TALKING

Sandy Ridge Music

Sandy Ridge Music

Reviews

PROS

  • Fun to use with a diverse range of synth sounds

  • Simple controls, easy to use right out of the box

  • Can create interesting colors when added with other effects

  • Some presets are really cool

  • Has adjustment capabilities, including for tracking issues

  • Includes a power cord and instructions for ease of use

  • Dry control allows for volume adjustment of uneffected signal

  • Good quality for the price

CONS

  • Only a few sounds are practically usable in songs

  • Poor sound quality, especially noticeable at higher volumes or through a PA

  • Significant latency, not suitable for fast music or complex playing

  • Latency affects tone detection, requiring additional noise gate and compression

  • Not suitable for playing chords due to mono output

  • Some users find the synth sounds have an "uncanny valley" quality

  • Tracking can be problematic, even though it's adjustable

Owner Insights

We analyzed real musician discussions from forums and Reddit to find what players love, question, and tweak about Electro-Harmonix Mono Synth.

Comparisons

  • The Data Corrupter is highlighted for better tracking and sound quality compared to the Bass Mono Synth, despite its own quirks.

    Source
  • The Source Audio C4 and Panda Audio Future Impact are highlighted as more versatile options, despite being pricier than the Mono Synth.

    Source
  • The upcoming Boss SY-200 may lead to a price drop in SY-1 pedals as owners switch, offering potential savings for buyers.

    Source
  • The Zoom MS series, especially the MS60 B, offers diverse synth patches and tracks well when paired with other pedals, though learning its layout can be challenging.

    Source
  • The Boss SY-1 is often preferred over the Mono Synth for its polyphonic capabilities and wider range of sounds.

    Source

User experience

  • A cheap, short-scale Korean bass tracked well with the pedal, contrasting with tracking issues experienced with a Warwick Fortress in different setups.

    Source
  • The 'Wub' setting is particularly favored for live jams, though it requires clean technique for optimal use.

    Source
  • Tracking issues arise with the Bass Mono Synth during fast or chordal play, making slow single-note play more reliable.

    Source
  • It's noted for being fun to use, especially for creating leads and loops, but some modes may sound too cheesy for certain tastes.

    Source

Use cases and applications

  • Precise muting techniques significantly improve tracking with monophonic effects, as noted by experienced users.

    Source
  • Using fingers instead of a pick and placing it first in the signal chain improves tracking for long washes and quick octave runs.

    Source
  • The Bass Mono Synth is favored for long-held notes or chords, with slider adjustments enhancing sound creation.

    Source
  • The pedal excels at creating mono-bass line sounds and is particularly effective for replicating the "Tainted Love" tone.

    Source

Features and functionality

  • The pedal has an annoying pause when turning on, which can be mitigated by using it in a loop for instant on/off switching.

    Source
  • The Electro-Harmonix Mono Synth can struggle with bright signals and overtones, but the tone knob helps mitigate these issues.

    Source

Setup and maintenance

  • Adjusting the sensitivity for each signal path is necessary, especially when switching between different bass pickups like the Ric 4003 and jazz basses.

    Source

Value and pricing

  • Owners have found it to be a worthwhile purchase if found at a low price, with good resale potential if it doesn't meet expectations.

    Source

Critic Reviews

Review: Electro-Harmonix Mono Synth

guitar.com

The Electro-Harmonix Mono Synth offers a plethora of synth voices, showcasing impressive tonal variety and a fun interface. However, it demands a strict monophonic approach, which could frustrate players accustomed to more fluid styles. While the initial voices shine, later options like Tinker and Blister miss the mark, feeling less musical and more niche. An expression pedal is a must to unlock its true potential, but the need for one adds to the overall cost. Great for adventurous guitarists, but not a one-size-fits-all solution.

Add

3.5 out of 5

Based on 2 Reviews and 6 Ratings

5 star
4 star
3 star
2 star
1 star
jules_jackson

Letdown

Does not track very well. Disappointed in how slow you have to play in order for it to work properly. Not a fan. Don't try to play chords on this thing, either.

Roles:
sandy_ridge

Good sounds but tracking can be iffy

It sounds great and has a lot of different options but you have to be very 'deliberate' on your picking if you are going to to avoid any tracking issues.

Artist usage

Add artist
See how Andrew Huang uses Electro-Harmonix Mono Synth

Andrew Huang

Singer, Guitarist

First Of October

...
Verified via YouTube

Seen being used at 3:45, Huang demos the EHX Mono Synth Pedal, his first time using it. He's a big fan of this pedal

See how Joey Walker uses Electro-Harmonix Mono Synth

Joey Walker

Singer, Guitarist

King Gizzard and The Lizard Wizard

...
Verified via Photo

In this photo of King Gizzard performing at Laneway Festival, you can see Joey with a Mono Synth on his pedalboard.

See how Russell Lissack uses Electro-Harmonix Mono Synth

Russell Lissack

Guitarist

Bloc Party

...
Verified via YouTube

Russell Lissack's guitar technician has confirmed that he uses the Electro-Harmonix Mono Synth on his new pedalboard to achieve a specific delay tone. This information is detailed in the YouTube video by Hemstock Guitars, titled "Russell Lissack of Bloc Party Pedalboard Rundown."

See how Will Swan uses Electro-Harmonix Mono Synth

Will Swan

Guitarist

Dance Gavin Dance

...
Verified via Premier Guitar

Continuing the theme from the previous photo, he's working with three more synth-y pedals from Electro-Harmonix: a C9 Organ Machine, a Mono Synth ("it makes cool fart sounds"), and a Synth9.

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 Mono Synth, it is most commonly used with the following gear.

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Community setups

Show yours
captainpossum

captainpossum

Gear IQ 188

B

beneshanks

Gear IQ 119

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