The Electro-Harmonix Slammi Plus is an Electro-Harmonix octave pedal, currently around $130.80. Close alternatives include the Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter and the Subdecay Octasynth Octave Synthesizer. It pairs well with the Dumble Overdrive Special Amp Head and the Fender Deluxe Reverb.
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.
- pitch
- tracking
- whammy
- octave
- chorus
- bass
- synth
- expressive
Price updated Aug 27, 2026
Genres the Electro-Harmonix Slammi Plus is commonly used in
- Experimental
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Electro-Harmonix Slammi Plus
Pedals that stack with the Electro-Harmonix Slammi Plus
MXR Distortion+
MXR
10% matchMXR Distortion+ leans toward compressed, and that's a real, usable character to pair with
Beetronics Swarm
Beetronics
10% matchBeetronics Swarm's own fuzzy character is the real reason this is worth trying
Roland SDE-3000D
Roland
6% matchPut Roland SDE-3000D after Electro-Harmonix Slammi Plus in the signal chain, clear of Electro-Harmonix Slammi Plus's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Caroline Guitar Company Meteore
Caroline Guitar Company
6% matchKeep Electro-Harmonix Slammi Plus's octave voice out front: Caroline Guitar Company Meteore goes after Electro-Harmonix Slammi Plus in the signal chain so its pristine voice doesn't muddy it — goes in the amp's FX loop (or last, into a clean amp)
Cheaper alternatives
Boutique & premium upgrades
Electro-Harmonix POG2 Polyphonic Octave Generator
Electro-Harmonix
72% similarityShared character: expression_pedal, mono_synth, tight_tracking
DigiTech WH-1 Whammy Pedal
Digitech
72% similarityShared character: whammy, expression_pedal, tight_tracking
DigiTech Whammy Pitch-Shifting Pedal
Digitech
71% similarityShared character: pitch_modulation, whammy, expression_pedal
Mu-Tron Octave Divider
pedal
71% similarityShared character: expression_pedal, mono_synth, tight_tracking
Boss X-100 Poly Shifter
Boss
70% similarityShared character: whammy, expression_pedal, one_octave
Boss XS 100 Poly Shifter
Boss
70% similarityShared character: whammy, expression_pedal, one_octave
Similar charactersee all similar tone character →
Electro-Harmonix Pitch Fork Polyphonic Pitch Shifter
Electro-Harmonix
75% similarityShared character: pitch_modulation, whammy, expression_pedal
Subdecay Octasynth Octave Synthesizer
Subdecay
73% similarityShared character: mono_synth, tight_tracking, one_octave
Meris MR Hedra
Meris
72% similarityShared character: pitch_modulation, whammy, mono_synth
Boss PS-6
Boss
70% similarityShared character: pitch_modulation, expression_pedal, tight_tracking
Mooer Polyphonic
Mooer
68% similarityShared character: pitch_modulation, tight_tracking, one_octave
EVH Pitch Fork
Evh
93% similaritysimilar tone character
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 Subdecay Octasynth Octave Synthesizer, the Meris MR Hedra. Budget picks: Boss PS-5 Super Shifter. Boutique upgrades: Electro-Harmonix POG2 Polyphonic Octave Generator, DigiTech WH-1 Whammy Pedal, DigiTech Whammy Pitch-Shifting Pedal.
What pairs well with the Electro-Harmonix Slammi Plus?+
Strong matches from rig and tone-complementarity evidence: Dumble Overdrive Special Amp Head, Fender Deluxe Reverb, MXR Distortion+ — Dumble Overdrive Special Amp Head's own dynamic character is the real reason this is worth trying.
How much does the Electro-Harmonix Slammi Plus cost?+
Around $130.80 (live listing price, updated Aug 27, 2026).