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Electro-Harmonix Intelligent Harmony Machine Harmonizer & Pitch Shifter Pedal

Enrich your melodies with intriguing harmonies!



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Product Description

Electro-Harmonix has innovated some of the most creative, tone-twisting effects pedals ever made! Their Intelligent Harmony Machine is no exception, designed to instantly add matching harmonies to what you play. It’s essentially like having one — or even two — guitarists jamming with you at the same time and always in perfect sync!

The EHX Intelligent Harmony Machine allows you to tap into the spellbinding sounds created by multi-lead guitar bands who play exquisite, multi-part harmonised solos. Plus, its ability to apply harmonies ranging from simple to sophisticated will totally transform what you play.

Key Features

  • Compact harmony-generating, pitch-shifting powerhouse!
  • Impeccable tracking and superb musical tone.
  • Two distinct modes: Intelligent Harmony and Polyphonic.
  • Intelligent Harmony mode generates diatonic harmonies in a set key based on the single notes you play. The Key Selector and #/- switches provide access to all 12 keys.
  • In Polyphonic Override mode you can play single notes and chords. The IHM’s 11-position Interval Selector switch lets you select the harmony.
  • In Momentary mode the effect is only active when the footswitch is depressed. Choose from instant shifts or set the time it takes the signal to sweep up and down.
  • Mix control sets the mix between your dry and shifted signals. Dry output adds signal routing, control options and flexibility.
  • Comes equipped with an EHX 9-volt power supply, and can also run on a 9-volt battery.

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Select your key and the Intelligent Harmony Machine will generate single note, diatonic harmonies with a huge range of choices that include both two- and three-part harmonies. Here are your choices:

  • 1: 6th Down
  • 2: Perfect 4th Down
  • 3: 3rd Down
  • 4: 3rd Up
  • 5: Perfect 4th Up
  • 6: Perfect 5th Up
  • 7: 6th Up
  • 8: 7th Up
  • 9: 3rd Up + 7th Up
  • 10: 3rd Up + 7th Up
  • 11: Perfect 5th Up + Octave Up

These sound so cool that EHX has included them as extra options for the multi-harmony parts (selections 9, 10 and 11) to give you even more choices:

  • 9 optional: 4th Down + 3rd Up
  • 10 optional: 3rd Up + 6th Up
  • 11 optional: Octave Down + 5th Up
  • 9 optional: 6th Down + 4th Down
  • 10 optional: 3rd Down + 3rd Up
  • 11 optional: Octave Down + 4th Down

The Intelligent Harmony Machine also performs perfect polyphonic pitch shifts, so the shifts you dial up are applied to chords as well as single notes. EHX has even included a Major/Minor switch so you can select whether 2nds and 3rds will be major or minor. Here are the interval selections that are available:

  • 1: Doubler
  • 2: Perfect 4th Down
  • 3: 3rd Down (minor on major)
  • 4: 3rd Up (minor or major)
  • 5: Perfect 4th Up
  • 6: Perfect 5th Up
  • 7: 2nd Down (minor or major)
  • 8: 2nd Up (minor or major)
  • 9: Octave Down
  • 10: Octave Up
  • 11: Perfect 5th Up + Octave Up


  • Circuit: Digital
  • Bypass: Buffered Bypass
  • Audio: Mono
  • Power Supply: 9.6VDC-200mA Power Adapter included (Optional 9V battery not included)
  • Dimensions: 4.5 x 2.75 x 2.1 inches
  • Current Draw: 26mA
Elliot Stent author picture

Written by Elliot Stent

Customer Reviews


3 reviews





Mr Kevin Flynn10th Aug 2022

Mr Keith Howe22nd May 2022

Nice pedal. Good quality build as you would expect and used sparingly, can add quite a bit to your sound. Experiment where to put ti in your effects chain, it can make quite a difference.

Value 4Looks 5Durability 4Sound 4

Mrs Linda Pell6th Jan 2022

Value 4Looks 4Durability 4Sound 4

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Andertons Music Company's Registered Office: 58-59 Woodbridge Road, Guildford, GU1 4RF. Andertons Music Company acts as a credit broker and not a lender and only offers credit products from Secure Trust Bank PLC trading as V12 Retail Finance. Not all products offered by Secure Trust Bank PLC are regulated by the Financial Conduct Authority. Andertons Music Company is authorised and regulated by the Financial Conduct Authority, firm registration number 716155. Credit provided subject to age and status.