The EHX Mod Rex is a kinetic tour-de-force that lets you weave compelling, shifting, musical tapestries. Whether you are a guitarist, synthesist or electronic musician you will find it inspires your creativity and stretches your musical boundaries.

The heart of the pedal are its four, independent modulation sections synced in time, they are:

1. MOD features great sounding EHX Vibrato, Flanger, Chorus or Phaser. The Depth knob lets you set the amount of the effect while Feedback controls the resonance of the Flanger and Phaser.

2. TREM delivers tremolo, an effect that modulates the volume of your signal. The Depth control sets tremolo intensity.

3. PAN modulates between left and right in stereo operation. In mono operation the PAN section acts as another tremolo section, but with the wave shapes all inverted!

4. FILTER offers a choice of a modulated LPF, HPF or BPF. In LPF (low pass filter) frequencies above a modulated cutoff point are cut. In HPF (high pass filter) frequencies below a modulated cutoff point are cut, and in BPF (band pass filter) frequencies above and below a modulated center point are cut.

Each section also features a choice of four LFO shape options: rising sawtooth, triangle, falling sawtooth or square wave. They affect the way the modulation transitions and provide advanced creative control over the specific section as well as the way they interact with each other.

The MOD REX delivers virtually limitless polyrhythmic possibilities.

Its TEMPO component gives you nine note-length choices for each of the four modulation sections. They are independently selectable in increments starting at a whole note and ranging thru subdivisions that go up to a 16th note. In addition, any of the sections can be bypassed.

The MOD REX’s tempo (displayed as beats per minute or BPM) is adjustable with the Tempo knob, Tap Tempo footswitch or by using an expression pedal into its EXP input. It can also be synced to an external device with MIDI Clock or an external pulse clock.

The pedal’s robust MIDI implementation enables you to sync devices quickly and easily as well as automate functions and changes so they occur precisely when and where you want them whether you are working at home, in a studio or live.

The MOD REX accepts MIDI to enable it to tempo sync the modulation rate with an external device, to recall presets via MIDI Program Change messages and to control any parameter on the MOD REX via Control Change messages.

The MOD REX lets you save and recall up to 100 presets. It comes from the factory with 20 great programs.

The pedal features full stereo input and output.

An external foot controller input makes banking up and down thru presets quick and easy.

• 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
• Power adapter included

Why To Buy From Rock City!

Established in 2015, Rock City Music Company is an independently owned music store for players by players. Located just outside of Detroit, Michigan, Rock City Music Company is a music mecca that encompasses everything from guitars and lessons, to vinyl records and t-shirts, to posters, accessories, our music-themed pinball machines and more.

Rock City has earned its rank  as one of the top places in the country for in-store events. Rock City has hosted legends such as Geddy Lee (Rush), Glenn Hughes (Deep Purple), Gary Holt (Slayer/Exodus), Blackberry Smoke, Nita Strauss (Alice Cooper) and many many more. Rock ’n’ Roll is our passion, and we strive to provide excellent service, and a great experience, both inside and outside of our store.

Ready to Rock, Right Out Of The Box: All of our guitars are maintained by our FMIC (Fender Musical Instruments Company) Certified in-house guitar technician, to ensure any guitar that leaves our hands is ready to play as soon as you receive it!

Fast Shipping & Communication: Our top priority is making sure that your gear arrives safely to you as soon as possible. Our staff members strive to pack and label your items for shipping within 2 hours of placing your order (During regular business hours). Items never take more than 24 hours to leave our possession.

Guitars, Basses, Amps, Cases and select other items ship via UPS Ground

Pedals & Accessories ship via USPS Priority & First Class Mail

Have a preferred shipping method? Let us know and we will do our best to accommodate

We appreciate your business more than you know and we show it! Our communication is second to none and very important to us.  You will have a dedicated and educated staff member overseeing your order, that can assist with any questions or concerns.

Is My New Guitar Protected During Shipment ? : All items are packed with extreme care and although we do our best to protect items from damage, sometimes it happens. Have no fear, all of our items are shipped fully insured at no additional cost to you.

Rock City Music Company is an official dealer of:

Reverend, Ibanez, Taylor, Martin, PRS, Gretsch, Fender, Charvel, Jackson, Epiphone, ESP/LTD, EVH, Takamine, Rock N Roll Relics, Sterling/MusicMan and Echopark Guitars.

Electro-Harmonix, Earthquaker Devices, Boss, MXR, Dunlop, Pro-Tone, Strymon and Catalinbread Effects Pedals

Orange, Fender, Boss, EVH and VOX amplifiers

Any questions? Feel free to contact us during store hours!

Monday - Thursday 11AM-7PM

Friday-Saturday 11AM-6PM

Sunday 11AM - 4PM

(All Times are Eastern Standard Time)

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