Instantly multiply your sound with the Electro-Harmonix Intelligent Harmony Machine, a compact harmony-generating and pitch-shifting powerhouse that adds one or two perfectly synced guitarists to your rig. With impeccable tracking and musical tone, it transforms single notes and chords into rich, diatonic harmonies or polyphonic pitch shifts—opening the door to multi-lead band textures and sophisticated solos.
Intelligent Harmony Mode generates diatonic harmonies in any key (12 keys via Key Selector and #/- switches), offering 11 intervals from 6th Down to Octave Up + Perfect 5th Up, plus optional multi-voice variations. Polyphonic Override Mode applies pitch shifts to chords and notes alike, with Major/Minor switch for 2nds/3rds. Moment Mode engages instant or sweepable shifts only while the footswitch is held.
Fine-tune with Mix control, Dry output for routing flexibility, and EHX 9V power supply included (or 9V battery). From classic dual-guitar voicings to futuristic textures, the IHM delivers pro-grade harmony and pitch control in a minimal footprint—perfect for stage, studio, or practice.
Select your key and the Intelligent Harmony Machines will generate single note, diatonic harmonies* with a huge range of choices that includes 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 + 5th Up |
| 10 |
3rd Up + 7th Up |
| 11 |
Perfect 5th Up + Octave Up |
These sound so cool that we’ve 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 pitch shifts you dial up are applied to chords as well as single notes. We’ve 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 |
