The Electro-Harmonix Intelligent Harmony Machine is an Electro-Harmonix octave pedal, currently around $181.10. Close alternatives include the Electro-Harmonix Pitch Fork Plus and the DigiTech Whammy Pitch-Shifting Pedal. It pairs well with the Mesa Boogie Mark I and the Synergy SL2 Module.
Electro-Harmonix Intelligent Harmony Machine
Electro-Harmonix · pedal
The Electro-Harmonix Intelligent Harmony Machine is a polyphonic pitch shifting harmonizer that generates musically correct harmonies based on a selected key and scale, automatically following your playing to add diatonic harmony voices. It can produce smart two part harmonies, octaves and pitch shifts that stay in key, plus detune and pitch effects, with controls for key, scale and harmony interval. From classic dual guitar harmony leads to lush layered textures, it tracks polyphonically and cleanly. It suits rock, metal, prog and experimental players who want intelligent, in key harmony lines, harmonized leads and pitch effects without manual interval juggling, in a compact and capable pedal.
- pitch
- harmonizer
- clean
- tracking
- octave
- metal
- prog
- lush
Price updated Aug 27, 2026
Genres the Electro-Harmonix Intelligent Harmony Machine is commonly used in
- Metal
- Rock
- Experimental
Amps that pair well with the Electro-Harmonix Intelligent Harmony Machine
Mesa Boogie Mark I
Mesa Boogie
17% matchMesa Boogie Mark I's mid-forward fills in what this transparent tone doesn't make on its own
Synergy SL2 Module
Synergy
tonal matchInto a transparent tone, Synergy SL2 Module brings the high gain it's missing
Friedman BE-Mini Head
Friedman
tonal matchThe transparent tone has headroom to spare — Friedman BE-Mini Head gives it high gain to fill it with
Egnater Tweaker 88 Head
Egnater
tonal matchRun Egnater Tweaker 88 Head into that transparent platform and it finally gets some low gain
Ceriatone 2202H
Ceriatone
tonal matchInto a transparent tone, Ceriatone 2202H brings the high gain it's missing
Friedman Jose LTD
Friedman
tonal matchThe transparent tone has headroom to spare — Friedman Jose LTD gives it high gain to fill it with
Hughes & Kettner Warp 7
Hughes & Kettner
tonal matchInto a transparent tone, Hughes & Kettner Warp 7 brings the high gain it's missing
Bad Cat Lynx 50
Bad Cat
tonal matchThe transparent tone has headroom to spare — Bad Cat Lynx 50 gives it high gain to fill it with
Pedals that stack with the Electro-Harmonix Intelligent Harmony Machine
Suhr Rufus Reloaded
Suhr
20% matchThe transparent tone has headroom to spare — Suhr Rufus Reloaded gives it fuzzy to fill it with
JHS Smiley
JHS Pedals
20% matchThe transparent tone has headroom to spare — JHS Smiley gives it fuzzy to fill it with
Old Blood Noise Endeavors BL-44 Reverse
Old Blood Noise Endeavors
7% matchKeep Electro-Harmonix Intelligent Harmony Machine's transparent voice out front: Old Blood Noise Endeavors BL-44 Reverse goes after Electro-Harmonix Intelligent Harmony Machine in the signal chain so its ambient voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Fender Hammertone Reverb
Fender
7% matchKeep Electro-Harmonix Intelligent Harmony Machine's transparent voice out front: Fender Hammertone Reverb goes after Electro-Harmonix Intelligent Harmony Machine in the signal chain so its lush voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Tone City Dry Martini
Tone City
tonal matchTone City Dry Martini's own voicing points at a clean amp's front end, and Electro-Harmonix Intelligent Harmony Machine delivers it
Fender Hammertone Overdrive
Fender
tonal matchElectro-Harmonix Intelligent Harmony Machine leans into a clean amp's front end, precisely the platform Fender Hammertone Overdrive wants
Ashdown Geezer Butler Signature
Ashdown
tonal matchInto Electro-Harmonix Intelligent Harmony Machine, Ashdown Geezer Butler Signature is right at home: it's built around a clean amp's front end
Black Arts Toneworks LSTR Fuzz
Black Arts Toneworks
tonal matchBlack Arts Toneworks LSTR Fuzz's own voicing points at a clean amp's front end, and Electro-Harmonix Intelligent Harmony Machine delivers it
Cheaper alternatives
Electro-Harmonix Slammi Plus
Electro-Harmonix
69% similarityShared character: pitch_modulation, tight_tracking, one_octave
Behringer Octavia Octave Fuzz
Behringer
66% similarityShared character: tight_tracking, one_octave, clean
Boss PS-6
Boss
66% similarityShared character: pitch_modulation, tight_tracking, one_octave
Boss PS-5 Super Shifter
Boss
90% similaritysimilar tone character
Boutique & premium upgrades
Similar charactersee all similar tone character →
Electro-Harmonix Pitch Fork Plus
Electro-Harmonix
71% similarityShared character: pitch_modulation, single_rig, tight_tracking
DigiTech Whammy Pitch-Shifting Pedal
Digitech
67% similarityShared character: pitch_modulation, tight_tracking, one_octave
Walrus Audio Luminary
Walrus Audio
66% similarityShared character: tight_tracking, one_octave, clean
440 Distribution DigiTech Drop Polyphonic Droptune
440 Distribution
66% similarityShared character: tight_tracking, one_octave, metal
EarthQuaker Devices Rainbow Machine
EarthQuaker Devices
65% similarityShared character: pitch_modulation, single_rig, tight_tracking
Hotone Skyline Harmony Pitch Shifter/Harmonist
Hotone
63% similarityShared character: pitch_modulation, tight_tracking
See all alternatives to the Electro-Harmonix Intelligent Harmony Machine (cheaper + boutique) →
Questions people ask
What are good alternatives to the Electro-Harmonix Intelligent Harmony Machine?+
The closest matches in character are the Electro-Harmonix Pitch Fork Plus, the DigiTech Whammy Pitch-Shifting Pedal, the Walrus Audio Luminary. Budget picks: Electro-Harmonix Slammi Plus, Behringer Octavia Octave Fuzz, Boss PS-6. Boutique upgrades: Alexander Pedals Fever Pitch, Meris Hedra Shifter.
What pairs well with the Electro-Harmonix Intelligent Harmony Machine?+
Strong matches from rig and tone-complementarity evidence: Mesa Boogie Mark I, Synergy SL2 Module, Friedman BE-Mini Head — Mesa Boogie Mark I's mid-forward fills in what this transparent tone doesn't make on its own.
How much does the Electro-Harmonix Intelligent Harmony Machine cost?+
Around $181.10 (live listing price, updated Aug 27, 2026).