The Donner Harmonic Square Octave/Pitch Shifter is a Donner octave pedal, currently around $54.49. Close alternatives include the Mooer Polyphonic and the Meris MR Hedra. It pairs well with the Ampeg SVT-CL and the Traynor SB106.
Donner Harmonic Square Octave/Pitch Shifter
Donner · pedal
The Donner Harmonic Square is an octave and pitch shifter pedal from the Chinese budget effects manufacturer Donner, delivering octave-up, octave-down, and pitch shifting effects for guitar. Provides classic sub-octave and upper octave effects along with pitch shifting capability at an accessible Donner budget price. Controls adjust the blend of octave and dry signal with pitch shift interval.
What stands out
“The Donner Harmonic Square is an octave and pitch shifter pedal from the Chinese budget effects manufacturer Donner, delivering octave-up, octave-down, and pitch shifting effects for guitar”
— from the listing
“provides classic sub-octave and upper octave effects along with pitch shifting capability at an accessible donner budget price”
— from the listing
“Controls adjust the blend of octave and dry signal with pitch shift interval”
— from the listing
“The Harmonic Square delivers octave and pitch shifting at budget Donner pricing, suited for players who want octave fuzz, sub-bass octave, or pitch shifting effects”
— from the community notes
“Use-case wise it suits experimental and genre-diverse players who want octave effects at a low cost”
— from the community notes
Trade-offs
“its standout weakness is the budget construction quality and tracking accuracy relative to premium pitch shifters”
— from the community notes
- octave
- pitch
- harmonic
- sub
- octave fuzz
- pitch shifter
- simple
- dry
Price updated Oct 24, 2026
Genres the Donner Harmonic Square Octave/Pitch Shifter is commonly used in
- Experimental
- Electronic
cited
Inferred from shared tonal signals, not a stated genre tag. - Shoegaze
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the Donner Harmonic Square Octave/Pitch Shifter
Ampeg SVT-CL
Ampeg
8% matchInto the SVT-CL's growling tube stage, the Harmonic Square's sub-octave tracking stays defined.
Comes later in the signal chain
Traynor SB106
Traynor
8% matchTraynor SB106's own full character is the real reason this is worth trying
Comes later in the signal chain
Pedals that stack with the Donner Harmonic Square Octave/Pitch Shifter
Xotic RC Booster
Xotic
7% matchXotic RC Booster leans toward transparent, and that's a real, usable character to pair with
Comes later in the signal chain
Boss BD-2 Blues Driver
Boss
7% matchBoss BD-2 Blues Driver leans toward full, and that's a real, usable character to pair with
Comes later in the signal chain
Carl Martin Headroom
Carl Martin
5% matchRun Carl Martin Headroom after Donner Harmonic Square Octave/Pitch Shifter in the signal chain, where it won't crowd Donner Harmonic Square Octave/Pitch Shifter — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Catalinbread Belle Epoch
Catalinbread
5% matchKeep Catalinbread Belle Epoch after Donner Harmonic Square Octave/Pitch Shifter in the signal chain, where it won't crowd Donner Harmonic Square Octave/Pitch Shifter — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Cheaper alternatives
Boutique & premium upgrades
MXR Sub Machine
MXR
41% similarityShared character: one octave
Mooer Tender Octaver MKII
Mooer
95% similaritysimilar tone character
Electro-Harmonix Pitch Fork Plus
Electro-Harmonix
95% similaritysimilar tone character
Electro-Harmonix Pico Pitch Fork
Electro-Harmonix
94% similaritysimilar tone character
Beetronics Whoctahell V2 Low Octave Beeast
Beetronics
93% similaritysimilar tone character
TC Electronic Pitchfork
TC Electronic
93% similaritysimilar tone character
Similar charactersee all similar tone character →
Mooer Polyphonic
Mooer
96% similaritysimilar tone character
Meris MR Hedra
Meris
93% similaritysimilar tone character
EVH Pitch Fork
Evh
93% similaritysimilar tone character
Electro-Harmonix POG
Electro-Harmonix
92% similaritysimilar tone character
EarthQuaker Devices Tentacle
EarthQuaker Devices
92% similaritysimilar tone character
See all alternatives to the Donner Harmonic Square Octave/Pitch Shifter (cheaper + boutique) →
Questions people ask
What are good alternatives to the Donner Harmonic Square Octave/Pitch Shifter?+
The closest matches in character are the Mooer Polyphonic, the Meris MR Hedra, the EVH Pitch Fork. Budget picks: TC Electronic Nether Octaver. Boutique upgrades: MXR Sub Machine, Mooer Tender Octaver MKII, Electro-Harmonix Pitch Fork Plus.
What pairs well with the Donner Harmonic Square Octave/Pitch Shifter?+
Strong matches from rig and tone-complementarity evidence: Ampeg SVT-CL, Traynor SB106, Xotic RC Booster — Into the SVT-CL's growling tube stage, the Harmonic Square's sub-octave tracking stays defined..
How much does the Donner Harmonic Square Octave/Pitch Shifter cost?+
Around $54.49 (live listing price, updated Oct 24, 2026).