Keyboard Effects With An Electro-Harmonix Mod Rex

‘The Electro-Harmonix Mod Rex Polyrhythmic Modulator is a hardware effects pedal that features four separate tempo-synced modulation sections.

In the video above, keyboardist Dave Sherman demonstrates some of the pedal’s possibilities when combined with straightforward stage keyboard type sounds. 


  • Up to four simultaneous modulation sections synced in time
  • MOD section offers a choice of Vibrato, Flanger, Chorus or Phaser
  • Standalone Tremolo, Modulated Panning and Modulated Filter sections
  • 9 tempo subdivision options for each modulation section
  • 4 LFO shape options for each modulation section
  • 100 storable presets
  • Full stereo input and output
  • Tap Tempo and Tempo Sync to an external device with MIDI Clock or an external pulse clock
  • Full MIDI control of all parameters and recalling of presets
  • External expression pedal input
  • External foot controller input to bank presets up and down

Pricing and Availability

‘The Electro-Harmonix Mod Rex is available now, with a street price of about $250.

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