The Electro-Harmonix Mod Rex is an Electro-Harmonix chorus pedal, currently around $165.64. Close alternatives include the Electro-Harmonix Worm and the Bookworm Effects Laughing Man Optical Tremolo V3. It pairs well with the Laney LX20R and the Laney LX35R.
Electro-Harmonix Mod Rex
Electro-Harmonix · pedal
The Electro-Harmonix Mod Rex is a polyrhythmic modulator pedal from Electro-Harmonix, delivering four simultaneous modulation types (tremolo, vibrato, filter, and panning) each with independent polyrhythmic sequencing at different rates. The Mod Rex allows each modulation type to run at its own tempo subdivision for complex polyrhythmic modulation textures that evolve continuously. Controls include individual Rate and Depth for each modulation type plus a Master Rate.
- modulation
- tremolo
- filter
- vibrato
- complex
- ambient
- experimental
- reverb
Price updated Aug 27, 2026
Genres the Electro-Harmonix Mod Rex is commonly used in
- Ambient
- Experimental
- Post Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Indie
cited
Inferred from shared tonal signals, not a stated genre tag. - Shoegaze
cited
Inferred from shared tonal signals, not a stated genre tag. - Lo Fi
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Electro-Harmonix Mod Rex
Pedals that stack with the Electro-Harmonix Mod Rex
Electro-Harmonix Big Muff Pi
Electro-Harmonix
7% matchWhat Electro-Harmonix Big Muff Pi brings here leans toward fuzzy — that's worth building a pairing around
Fulltone OCD
Fulltone
7% matchWhat Fulltone OCD brings here leans toward full — that's worth building a pairing around
Meris LVX Delay
Meris
6% matchRun Meris LVX Delay after Electro-Harmonix Mod Rex in the signal chain, clear of Electro-Harmonix Mod Rex's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Old Blood Noise Endeavors Dark Star V3
Old Blood Noise Endeavors
6% matchKeep Old Blood Noise Endeavors Dark Star V3 after Electro-Harmonix Mod Rex in the signal chain, clear of Electro-Harmonix Mod Rex's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Cheaper alternatives
Boffin FX Vibratron
Boffin Fx
68% similarityShared character: vibrato, tremolo, reverb
Caline CP-13 Super Chorus
Caline
67% similarityShared character: vibrato, ambient, reverb
Mr. Black Downward Spiral
Mr Black
66% similarityShared character: tremolo, ambient, reverb
Carl Martin Atlantic Chorus
Carl Martin
93% similaritysimilar tone character
Boutique & premium upgrades
Alexander Pedals Equilibrium DLX Vintage Modulation
Alexander Pedals
70% similarityShared character: vibrato, tremolo, reverb
Death By Audio Space Bender
Death By Audio
68% similarityShared character: vibrato, reverb, modulation
Mr. Black Analog chorus vibrato deluxe
Mr Black
68% similarityShared character: vibrato, ambient, reverb
Carl Martin TremO'vibe
Carl Martin
95% similaritysimilar tone character
Universal Audio Astra Modulation Machine
Universal Audio
93% similaritysimilar tone character
Similar charactersee all similar tone character →
Electro-Harmonix Worm
Electro-Harmonix
71% similarityShared character: vibrato, filter, tremolo
Bookworm Effects Laughing Man Optical Tremolo V3
Bookworm Effects
70% similarityShared character: vibrato, tremolo, reverb
Henretta Engineering H-Bomb Trembrato
Henretta Engineering
67% similarityShared character: vibrato, tremolo, modulation
Source Audio Vertigo
Source Audio
67% similarityShared character: vibrato, tremolo, ambient
Dawner Prince Starla Tap Tempo Tremolo
Dawner Prince
67% similarityShared character: tremolo, ambient, modulation
Dreadbox Treminator
Dreadbox
94% similaritysimilar tone character
See all alternatives to the Electro-Harmonix Mod Rex (cheaper + boutique) →
Questions people ask
What are good alternatives to the Electro-Harmonix Mod Rex?+
The closest matches in character are the Electro-Harmonix Worm, the Bookworm Effects Laughing Man Optical Tremolo V3, the Henretta Engineering H-Bomb Trembrato. Budget picks: Boffin FX Vibratron, Caline CP-13 Super Chorus, Mr. Black Downward Spiral. Boutique upgrades: Alexander Pedals Equilibrium DLX Vintage Modulation, Death By Audio Space Bender, Mr. Black Analog chorus vibrato deluxe.
What pairs well with the Electro-Harmonix Mod Rex?+
Strong matches from rig and tone-complementarity evidence: Laney LX20R, Laney LX35R, Electro-Harmonix Big Muff Pi — Laney LX20R is voiced for Marshall-style amps — Electro-Harmonix Mod Rex gives it exactly that.
How much does the Electro-Harmonix Mod Rex cost?+
Around $165.64 (live listing price, updated Aug 27, 2026).