Pricing and availability
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Average Price: $207
Standard/Professional
$150
$601+
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Based on price data from 6 merchants for "Electro-Harmonix Mod Rex". Prices shown reflect NEW condition. Tracking began Apr 2, 2026.
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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 ManualProduct 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
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What types of modulation effects does the Electro-Harmonix Mod Rex offer?
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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.
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Can the Electro-Harmonix Mod Rex be used with a stereo setup?
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Yes, the Mod Rex is equipped with stereo inputs and outputs, allowing it to be integrated into a stereo setup for expansive soundscapes.
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Does the Electro-Harmonix Mod Rex support MIDI control?
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Yes, the Mod Rex features a MIDI input, enabling synchronization with other MIDI-equipped devices for complex rhythmic and modulation patterns.
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What power requirements does the Electro-Harmonix Mod Rex have?
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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.
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How does the Electro-Harmonix Mod Rex handle bypass switching?
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The Mod Rex uses buffered bypass switching, which helps maintain signal integrity across long cable runs and complex pedalboard setups.
Videos
EHX
Electro-Harmonix Mod Rex Polyrhythmic Modulator
Reviews
PROS
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Midi function enhances musical creativity
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Syncs well with drum machines for layered effects
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Versatile modulation options from standard to experimental sounds
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Intuitive interface despite complex capabilities
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Exceptional in stereo mode for immersive sound experiences
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Responsive and accurate tap tempo feature
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Effective for both keyboards and guitars
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Superior tremolo sounds and modulation versatility
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Encourages exploration of complex rhythms and textures
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Competitively priced for its wide range of features
CONS
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Limited waveform options available
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Lacks a master blend knob for overall effect control
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Some controls (e.g., pitch shifting, filter) could use additional tweaking options
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Expression pedal integration could be improved
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Basic individual effects require creative layering for complexity
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Tap tempo functionality can be inconsistent
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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
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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.
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The pedal's global tempo allows different modulation stages to be set to different subdivisions, enhancing its polyrythmic capabilities.
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Use cases and applications
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The Mod Rex is particularly impactful in a stereo setup, enhancing the Pan section's left-to-right sweep.
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All four modulation effects can be used simultaneously, and the pedal can store 100 presets, though stacking within the Mod section is not possible.
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The Mod Rex is favored for creating 'interludes' between songs or song parts, adding variety and interest in performances.
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User experience
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Owners report the pedal can be noisy and suggest it lacks a blend knob, affecting subtle effect application.
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Some users find it challenging to use all modulation effects at once without them sounding static due to shared BPM subdivisions.
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Owners suggest the Mod Rex is more suited for synth/keyboard setups rather than traditional guitar pedalboards.
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Comparisons
Critic Reviews
4.0 out of 5
Based on 0 Reviews and 1 Rating
Artist usage
Add artist
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.
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
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