The Electro-Harmonix Slammi Plus is an Electro-Harmonix octave pedal, currently around $126.05. Close alternatives include the Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter and the Boss PS-6. It pairs well with the Park P50 Classic and the Bad Cat Cub.
Electro-Harmonix Slammi Plus
Electro-Harmonix · pedal
The Electro-Harmonix Slammi Plus is a polyphonic pitch shifter and harmony pedal combining glitch-free pitch shifting over a plus or minus three-octave range with a built-in treadle for expressive whammy-style sweeps. An 11-position Shift switch selects the interval, from Detune for chorus and doubling through minor and major seconds, thirds, fourths, fifths, sixths, and one, two, or three octaves. A Dual Mode outputs two pitch-shifted intervals at once for harmonies, and an X-Fade function fixes the interval and crossfades between dry and shifted notes or between two shifted intervals. Tracking is fast and glitch-free even on chords, making it work for guitar, bass, and synth. It functions as a Pitch Fork and expression pedal in one and is often compared favorably to the DigiTech Whammy.
What stands out
“The Electro-Harmonix Slammi Plus is a polyphonic pitch shifter and harmony pedal combining -free pitch shifting over a plus or minus three-octave range with a built-in treadle for expressive whammy-style sweeps”
— from the listing
“Its standout strengths are clean, fast polyphonic tracking, the wide three-octave range, the harmony and crossfade features, and strong value compared to rivals”
— from the community notes
“The Dual Mode harmonies and X-Fade crossfades add flexibility beyond a basic whammy”
— from the community notes
“An 11-position Shift switch selects the interval, from Detune for chorus and doubling through minor and major seconds, thirds, fourths, fifths, sixths, and one, two, or three octaves”
— from the listing
“The 11-position interval switch, Dual Mode, and X-Fade crossfade give it real depth, effectively combining a whammy, a Pitch Fork, and an expression pedal”
— from the reviews
- pitch
- tracking
- whammy
- octave
- expression pedal
- chorus
- bass
- pitch shifter
Price updated Oct 23, 2026
Genres the Electro-Harmonix Slammi Plus is commonly used in
- Experimental
cited
Inferred from shared tonal signals, not a stated genre tag. - Electronic
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Electro-Harmonix Slammi Plus
Park P50 Classic
Park
28% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
Park P50 Classic leans this dynamic tone toward compressed, which it doesn't make on its own
Comes later in the signal chain
Bad Cat Cub
Bad Cat
24% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
What Bad Cat Cub brings here leans toward harmonically rich — that's worth building a pairing around
Comes later in the signal chain
Ceriatone British Style 2525
Ceriatone
tonal matchComes later in the signal chain
Into a dynamic tone, Ceriatone British Style 2525 brings a pull toward compressed that's missing
Vox AC30S1 OneTwelve 30W 1x12 Combo
Vox
tonal matchComes later in the signal chain
Into a dynamic tone, Vox AC30S1 OneTwelve 30W 1x12 Combo brings a pull toward compressed that's missing
Fryette Power Station 100
Fryette
tonal matchComes later in the signal chain
Fryette Power Station 100 leans this dynamic tone toward compressed, which it doesn't make on its own
Kustom HV30 Tube
Kustom
tonal matchComes later in the signal chain
Kustom HV30 Tube leans this dynamic tone toward compressed, which it doesn't make on its own
Mesa/Boogie Stiletto Deuce Stage II
Mesa Boogie
tonal matchComes later in the signal chain
Mesa/Boogie Stiletto Deuce Stage II leans this dynamic tone toward compressed, which it doesn't make on its own
Friedman PT-20
Friedman
tonal matchComes later in the signal chain
Friedman PT-20 leans this dynamic tone toward compressed, which it doesn't make on its own
Pedals that stack with the Electro-Harmonix Slammi Plus
Origin Effects RevivalDrive
Origin Effects
23% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
Into a dynamic tone, Origin Effects RevivalDrive brings a pull toward compressed that's missing
Comes later in the signal chain
JHS PackRat 9-Way Rodent Distortion
JHS Pedals
22% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain. (dynamic → compressed)
JHS PackRat 9-Way Rodent Distortion leans this dynamic tone toward compressed, which it doesn't make on its own
Comes later in the signal chain
JHS Lucky Cat Delay limited edition
JHS Pedals
11% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Run JHS Lucky Cat Delay limited edition after Electro-Harmonix Slammi Plus in the signal chain, where it won't crowd Electro-Harmonix Slammi Plus — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Echoplex EP-3
Echoplex
10% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor.
Run Echoplex EP-3 after Electro-Harmonix Slammi Plus in the signal chain, where it won't crowd Electro-Harmonix Slammi Plus — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
DigiTech DOD Compressor 280
Digitech
tonal matchComes earlier in the signal chain
DigiTech DOD Compressor 280 leans this dynamic tone toward compressed, which it doesn't make on its own
DigiTech XBS Bass Squeeze
Digitech
tonal matchComes earlier in the signal chain
DigiTech XBS Bass Squeeze leans this dynamic tone toward compressed, which it doesn't make on its own
Fairfield Circuitry 20% More
Fairfield Circuitry
tonal matchComes later in the signal chain
Fairfield Circuitry 20% More leans this dynamic tone toward compressed, which it doesn't make on its own
Tech 21 CompTortion
Tech 21
tonal matchComes later in the signal chain
Into a dynamic tone, Tech 21 CompTortion brings a pull toward compressed that's missing
Cheaper alternatives
Boutique & premium upgrades
DigiTech WH-1 Whammy Pedal
Digitech
69% similarityShared character: whammy, expression pedal, tight tracking
Electro-Harmonix Pitch Fork Plus
Electro-Harmonix
64% similarityShared character: pitch modulation, tight tracking, one octave
Boss X-100 Poly Shifter
Boss
63% similarityShared character: whammy, expression pedal, one octave
Boss XS 100 Poly Shifter
Boss
63% similarityShared character: whammy, expression pedal, one octave
Electro-Harmonix Pico Pitch Fork
Electro-Harmonix
61% similarityShared character: pitch modulation, tight tracking, one octave
DigiTech Whammy DT
Digitech
61% similarityShared character: whammy, pitch modulation, expression pedal
Similar charactersee all similar tone character →
Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter
Electro-Harmonix
69% similarityShared character: pitch modulation, whammy, expression pedal
Boss PS-6
Boss
67% similarityShared character: pitch modulation, expression pedal, tight tracking
Meris MR Hedra
Meris
64% similarityShared character: pitch modulation, whammy, mono synth
EVH Pitch Fork
Evh
63% similarityShared character: expression pedal, tight tracking, one octave
Hotone Skyline Harmony Pitch Shifter/Harmonist
Hotone
59% similarityShared character: pitch modulation, tight tracking
DigiTech Whammy MN Mono Neon
Digitech
52% similarityShared character: pitch modulation, whammy, expression pedal
See all alternatives to the Electro-Harmonix Slammi Plus (cheaper + boutique) →
Questions people ask
What are good alternatives to the Electro-Harmonix Slammi Plus?+
The closest matches in character are the Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter, the Boss PS-6, the Meris MR Hedra. Budget picks: Boss PS-5 Super Shifter, Donner Harmonic Square Octave/Pitch Shifter. Boutique upgrades: DigiTech WH-1 Whammy Pedal, Electro-Harmonix Pitch Fork Plus, Boss X-100 Poly Shifter.
What pairs well with the Electro-Harmonix Slammi Plus?+
Strong matches from rig and tone-complementarity evidence: Park P50 Classic, Bad Cat Cub, Ceriatone British Style 2525 — Park P50 Classic leans this dynamic tone toward compressed, which it doesn't make on its own.
How much does the Electro-Harmonix Slammi Plus cost?+
Around $126.05 (live listing price, updated Oct 23, 2026).