Pricing and availability

We compare 600+ stores and found this item at 8 stores. Prices updated .

Sweetwater
4.5 (5)
$283.80
Guitar Center
5.0 (1)
$283.80
Amazon
5.0 (2)
$169.00
Reverb
5.0 (8)
$169.00 New
$90.00 Used
Thomann
4.1 (9)
$164.00 $163.00 $1.00 · All time low

Average Price: $207

Standard/Professional

$150

$601+

Price Tier

Budget

Standard

High-end

Price History

Based on price data from 6 merchants for "Electro-Harmonix Mod Rex". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.

* Product prices and availability are updated by Equipboard every 24hrs and are subject to change. Equipboard may receive compensation for purchases made at participating retailers linked on this site. This compensation does not affect what products or prices are displayed, or the order of prices listed. For more information, please refer to our affiliate disclosure.

Description

Unleash the polyrhythmic modulation madness with the Electro-Harmonix Mod Rex. This multi-dimensional pedal is a game-changer for those looking to add depth and dynamism to their soundscapes. Equipped with four independent modulation effects sections, the Mod Rex is a sonic playground waiting to be explored.

The Mod Rex doesn't just cater to guitarists, its true stereo operation makes it an ideal companion for bassists, synthesizers, and other electronic instruments. The pedal is designed with nine unique note-length choices, allowing you to craft expansive panning effects and complex polyrhythmic layers. This pedal is all about versatility and integration, with tempo control via the knob, tap tempo footswitch, expression input, or even MIDI clock.

Each effects section of the Mod Rex can be individually modulated by its own LFO, resulting in an exciting array of potential sonic textures. From classic vibrato, flanger, chorus, to phaser effects, the Mod Rex has it all. Want to create animated panning effects or modulate a filter with selectable lowpass, highpass, and bandpass filter modes? No problem! With the Mod Rex, the possibilities are endless.

Key Features:

  • Modulation effects pedal for guitar, bass, and synthesizers
  • Full stereo input and output
  • Mod section features vibrato, flanger, chorus, and phaser effects
  • Trem section delivers classic tremolo effects with depth control
  • Pan section creates animated panning effects, even from a mono input source
  • Filter section allows you to modulate a filter with selectable lowpass, highpass, and bandpass filter modes
  • Each section can be individually modulated by its own LFO, with 4 LFO waveshapes to choose from
  • 9 different selectable time divisions for each section
  • Save and recall up to 100 presets
  • Control tempo via knob, footswitch, external switch or expression pedal, or MIDI clock
  • Comprehensive MIDI implementation — any parameter can be controlled by MIDI CC messages.

Owner's manual

Electro-Harmonix Mod Rex User Manual

Product specs

Pedal Type Modulation Effects
Analog/Digital Digital
Inputs 2 x 1/4" (mono, L/R)
Outputs 2 x 1/4" (mono, L/R)
MIDI In
Other I/O 1 x 1/4" (expression), 1 x 1/4" (controller switch)
Bypass Switching Buffered
Power Source 9.6V DC 200mA power supply (included)
Power Usage 100mA
Height 2.25"
Width 4.75"
Depth 4.0"

FAQs

What types of modulation effects does the Electro-Harmonix Mod Rex offer?

The Electro-Harmonix Mod Rex provides four independent modulation sections: Mod, Trem, Pan, and Filter, each with its own dedicated controls for extensive sound-shaping possibilities.

Can the Electro-Harmonix Mod Rex be used with a stereo setup?

Yes, the Mod Rex is equipped with stereo inputs and outputs, allowing it to be integrated into a stereo setup for expansive soundscapes.

Does the Electro-Harmonix Mod Rex support MIDI control?

Yes, the Mod Rex features a MIDI input, enabling synchronization with other MIDI-equipped devices for complex rhythmic and modulation patterns.

What power requirements does the Electro-Harmonix Mod Rex have?

The Mod Rex requires a 9.6V DC 200mA power supply, which is included with the pedal, ensuring it is ready to use right out of the box.

How does the Electro-Harmonix Mod Rex handle bypass switching?

The Mod Rex uses buffered bypass switching, which helps maintain signal integrity across long cable runs and complex pedalboard setups.

EHX

EHX

Electro-Harmonix Mod Rex Polyrhythmic Modulator

Video thumbnail for Electro-Harmonix Mod Rex Polyrhythmic Modulator by EHX

Electro-Harmonix Mod Rex Polyrhythmic Modulator

EHX

EHX

Video thumbnail for Electro-Harmonix Mod Rex Polyrhythmic Modulator Demo with Keyboard by EHX

Electro-Harmonix Mod Rex Polyrhythmic Modulator Demo with Keyboard

EHX

EHX

Video thumbnail for Electro Harmonix Mod Rex Polyrhythmic Modulator of love by gearmanndude

Electro Harmonix Mod Rex Polyrhythmic Modulator of love

gearmanndude

gearmanndude

Video thumbnail for Electro Harmonix Mod Rex Pedal - AES 2018 by Sound On Sound magazine

Electro Harmonix Mod Rex Pedal - AES 2018

Sound On Sound magazine

Sound On Sound magazine

Video thumbnail for Video Manual: Electro Harmonix Mod Rex Polyrythmic Modulator by Pedal Experiments

Video Manual: Electro Harmonix Mod Rex Polyrythmic Modulator

Pedal Experiments

Pedal Experiments

Video thumbnail for Footswitch Sushi | Electro Harmonix Mod Rex Demo @ Klangfarbe (no talking) by Klangfarbe “Musikhaus Klangfarbe”

Footswitch Sushi | Electro Harmonix Mod Rex Demo @ Klangfarbe (no talking)

Klangfarbe “Musikhaus Klangfarbe”

Klangfarbe “Musikhaus Klangfarbe”

Video thumbnail for Electro Harmonix Mod Rex Poly-Rhythmic Modulator | Gear4music demo by Gear4music Guitars

Electro Harmonix Mod Rex Poly-Rhythmic Modulator | Gear4music demo

Gear4music Guitars

Gear4music Guitars

Video thumbnail for Strings Quick Demo : Electro-Harmonix MOD REX by Strings Shop

Strings Quick Demo : Electro-Harmonix MOD REX

Strings Shop

Strings Shop

Reviews

PROS

  • Midi function enhances musical creativity

  • Syncs well with drum machines for layered effects

  • Versatile modulation options from standard to experimental sounds

  • Intuitive interface despite complex capabilities

  • Exceptional in stereo mode for immersive sound experiences

  • Responsive and accurate tap tempo feature

  • Effective for both keyboards and guitars

  • Superior tremolo sounds and modulation versatility

  • Encourages exploration of complex rhythms and textures

  • Competitively priced for its wide range of features

CONS

  • Limited waveform options available

  • Lacks a master blend knob for overall effect control

  • Some controls (e.g., pitch shifting, filter) could use additional tweaking options

  • Expression pedal integration could be improved

  • Basic individual effects require creative layering for complexity

  • Tap tempo functionality can be inconsistent

  • Absence of dedicated on/off switches for each effect

Owner Insights

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

Features and functionality

  • The Mod Rex consists of four modulation sections: Filter, Pan, Trem, and Mod, each with depth and waveform controls; Filter and Mod have extra parameters.

    Source
  • The pedal's global tempo allows different modulation stages to be set to different subdivisions, enhancing its polyrythmic capabilities.

    Source

Use cases and applications

  • The Mod Rex is particularly impactful in a stereo setup, enhancing the Pan section's left-to-right sweep.

    Source
  • All four modulation effects can be used simultaneously, and the pedal can store 100 presets, though stacking within the Mod section is not possible.

    Source
  • The Mod Rex is favored for creating 'interludes' between songs or song parts, adding variety and interest in performances.

    Source

User experience

  • Owners report the pedal can be noisy and suggest it lacks a blend knob, affecting subtle effect application.

    Source
  • Some users find it challenging to use all modulation effects at once without them sounding static due to shared BPM subdivisions.

    Source
  • Owners suggest the Mod Rex is more suited for synth/keyboard setups rather than traditional guitar pedalboards.

    Source

Comparisons

  • The Mod Rex is compared to the Super Pulsar for its feature-rich design but is noted to be bulkier and pricier than alternatives like the Zoom MultiStomp.

    Source
  • The Mod Rex is often compared to the EHX Super Pulsar for tremolo effects, but users find it limiting due to BPM-tied rates.

    Source

Software and compatibility

  • The pedal's MIDI sync feature is praised for its compatibility with MIDI-syncable loopers and delays.

    Source

Critic Reviews

Electro-Harmonix Mod Rex review | MusicRadar

musicradar.com

Electro-Harmonix's Mod Rex is a polyrhythmic modulator that cleverly synchronizes four effects, offering a vast range of rhythmic possibilities. With its user-friendly interface and solid sound quality, it stands out as a creative tool for both stage and studio. However, the glaring blue LEDs might be too bright for some, potentially overshadowing its innovative design. Overall, while it may not replace standalone pedals, its unique ability to blend effects in a synchronized manner makes it a worthy addition to any pedalboard.

positive

Electro Harmonix Mod Rex Polyrhythmic Modulator - Effects - Harmony Central

harmonycentral.com

New Gear Review: Mod Rex Effects Pedal by Electro-Harmonix — SonicScoop

sonicscoop.com

4.0 out of 5

Based on 0 Reviews and 1 Rating

5 star
4 star
3 star
2 star
1 star

Artist usage

Add artist
See how Julien Baker uses Electro-Harmonix Mod Rex

Julien Baker

Singer, Guitarist

boygenius

...
Verified via Photo

In this May 17, 2021 Instagram post Julien Baker shared a time-lapse video of her overhauling her pedal board in preparation for the Little Oblivions tour, as well as the above picture of the end result.

The Mod Rex is at the left, just under the Walrus Audio Descent.

See how Andrew Marrah uses Electro-Harmonix Mod Rex

Andrew Marrah

Guitarist, Keyboardist

Airiel

...
Verified via Reddit

A photograph of Andrew Marrah's pedalboard, shared by Reddit user "slantednotenchantedd," clearly shows the Electro-Harmonix Mod Rex, confirming its use by the artist.

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 Mod Rex, it is most commonly used with the following gear.

Community setups

Show yours
awwim

awwim

Gear IQ 1869

More Electro-Harmonix Multi Effects Pedals

Accessories & Related Items

Similar

Gear Guides

  • Added to Equipboard on by

    gchiaren
    gchiaren

    Gear IQ 37552