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Electro-Harmonix Mod Rex polyrhythmic modulator pedal in metallic silver finish

Electro Harmonix

Electro-Harmonix Mod Rex Polyrhythmic Modulator Guitar Pedal

SKU CH-Z8WB-5DEW3

A polyrhythmic modulator with four independent sections — MOD, tremolo, pan and filter — each offering four LFO shapes and nine selectable note lengths

  • Four independent modulation sections — MOD, TREM, PAN, FILTER
  • Nine selectable note lengths per section for polyrhythmic patterns
  • Four LFO wave shapes per section: rising saw, triangle, falling saw, square
  • MOD section includes vibrato, flanger, chorus and phaser with depth and feedback
  • FILTER offers low-pass, high-pass and band-pass modes with modulated cutoff

Versatile LFO Shapes for Creative Control

The Electro-Harmonix Mod Rex provides four independent modulation sections — MOD, TREM, PAN, and FILTER — each offering four selectable LFO shapes including rising sawtooth, triangle, falling sawtooth, and square wave. This polyrhythmic modulator suits guitarists, synthesists, and electronic musicians seeking deep, tempo-synced texture generation across stereo or mono rigs.

Check Signal Chain and Power Requirements

Verify your pedalboard power supply delivers the required current at the correct voltage and polarity for this unit. Ensure your amplifier or interface supports stereo input if you intend to use the PAN section’s full stereo imaging; in mono, PAN functions as an additional tremolo with inverted wave shapes. Confirm available space for the pedal’s footprint and top-mounted jack layout.

Ideal for Polyrhythmic Sound Design

Players who want independent, tempo-synced modulation voices across vibrato, flanger, chorus, phaser, tremolo, panning, and filter types will find this pedal inspiring. It is less suited for musicians needing only a single, simple modulation effect or those requiring built-in preset storage and MIDI clock synchronisation not mentioned in the specifications.

Highlights

  • Four independent modulation sections — MOD, TREM, PAN, FILTER
  • Nine selectable note lengths per section for polyrhythmic patterns
  • Four LFO wave shapes per section: rising saw, triangle, falling saw, square
  • MOD section includes vibrato, flanger, chorus and phaser with depth and feedback
  • FILTER offers low-pass, high-pass and band-pass modes with modulated cutoff

Specifications

No published specifications for this item yet.

Questions about this item

Does the pedal include a power supply, cables or a footswitch, or must they be purchased separately?

The pedal ships as a standalone unit; a 9 V centre-negative power supply, instrument cables and any expression or footswitch controllers are sold separately.

With four independent sections — MOD, TREM, PAN and FILTER — how do I decide which to engage for a given sound?

Each section runs simultaneously and is synced to the same clock; enable any combination by turning its Depth knob above zero and selecting the desired LFO shape and note length for that section.

What do the nine note-length choices actually do to the modulation speed when the pedal is running live?

Each section divides or multiplies the master tempo by its chosen note value — whole, half, quarter, eighth, triplet, dotted, etc. — so the LFO rate locks to the song’s timing in real time.

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