The MXR Poly Blue Octave is an MXR fuzz pedal, currently around $213.71. Close alternatives include the Beetronics Swarm Fuzz Harmonizer and the Pigtronix Octava. It pairs well with the Magnatone 280 and the Gibson Les Paul LP-1 Preamp.
MXR Poly Blue Octave
MXR · pedal
The MXR Poly Blue Octave is a polyphonic octave pedal combining pitch-shifting with fuzz and modulation, expanding on MXR's classic Blue Box with four independently controllable octave voices: one and two octaves down, and one and two octaves up. Each octave voice is polyphonic by default, tracking full chords cleanly rather than only single notes, and each can be blended to taste in the mix. Beyond octave shifting, it adds phase modulation and an independent fuzz stage that operates separately from the octave and modulation effects, plus expression pedal control for real-time sweeping. Tracking is described as exceptional in both polyphonic and mono modes.
What stands out
“The MXR Poly Blue Octave is a polyphonic octave pedal combining pitch-shifting with fuzz and modulation, expanding on MXR's classic Blue Box with four independently controllable octave voices: one and two octaves down, and one and two octav…”
— from the listing
“Beyond octave shifting, it adds phase modulation and an independent fuzz stage that operates separately from the octave and modulation effects, plus expression pedal control for real-time sweeping”
— from the listing
“Standout strength is genuinely usable polyphonic tracking with chords, , which many octave pedals struggle with”
— from the community notes
“tracking is described as exceptional in both polyphonic and mono modes”
— from the listing
“Primary use case spans both practical thickening (blended octave-down bass-like tones) and experimental synth-adjacent textures via the four-voice octave engine plus fuzz and modulation”
— from the community notes
- octave
- fuzz
- tracking
- modulation
- stage
- expression pedal
- mono
- mix
Price updated Oct 24, 2026
Genres the MXR Poly Blue Octave is commonly used in
- Experimental
- Noise Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Stoner Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Electronic
cited
Inferred from shared tonal signals, not a stated genre tag. - Shoegaze
cited
Inferred from shared tonal signals, not a stated genre tag. - Ambient
cited
Inferred from shared tonal signals, not a stated genre tag.
Amps that pair well with the MXR Poly Blue Octave
Magnatone 280
Magnatone
19% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (fuzzy → modulated)
Run fuzzy into Magnatone 280 for more modulated on top
Comes later in the signal chain
Gibson Les Paul LP-1 Preamp
Gibson
tonal matchComes later in the signal chain
Put Gibson Les Paul LP-1 Preamp in front and the fuzzy tone leans further toward modulated
Magnatone 510
Magnatone
tonal matchComes later in the signal chain
Put Magnatone 510 in front and the fuzzy tone leans further toward modulated
Pedals that stack with the MXR Poly Blue Octave
JAM Pedals Retrovibe mk3
Jam Pedals
20% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (fuzzy → modulated)
Put JAM Pedals Retrovibe mk3 after MXR Poly Blue Octave in the signal chain, clear of MXR Poly Blue Octave's own gain stage
Comes later in the signal chain
Fender Blender
Fender
18% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (fuzzy → octave)
Put Fender Blender in front and the fuzzy tone leans further toward octave
Catalinbread Giygas
Catalinbread
18% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (fuzzy → octave)
Run fuzzy into Catalinbread Giygas for more octave on top
Comes earlier in the signal chain
Walrus Audio Melee Wall of Noise Black
Walrus Audio
12% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (fuzzy → octave)
Keep Walrus Audio Melee Wall of Noise Black after MXR Poly Blue Octave in the signal chain, clear of MXR Poly Blue Octave's own gain stage — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Electro-Harmonix Stereo Memory Man Vintage
Electro-Harmonix
12% matchsits in the right chain slotPlaced for where it does its job cleanly in the chain, not for a tonal interaction with the anchor. (fuzzy → modulated)
Electro-Harmonix Stereo Memory Man Vintage's analog warmth voice goes after MXR Poly Blue Octave in the signal chain — it's not there to compete with MXR Poly Blue Octave's own octave character — goes in the amp's FX loop (or last, into a clean amp)
Comes later in the signal chain
Jackson Audio Bloom V2 Compressor/EQ
Jackson Audio
10% matchshapes the dynamic responseShapes how the tone responds to picking dynamics rather than its frequency or gain.
MXR Poly Blue Octave leans toward octave, and that's a real, usable character to pair with
Comes earlier in the signal chain
Subdecay Octave Theory Octave Modulator Synthesizer
Subdecay
tonal matchComes earlier in the signal chain
Subdecay Octave Theory Octave Modulator Synthesizer goes in front of MXR Poly Blue Octave — pitch tracking is cleanest before anything colours the note
EarthQuaker Devices Swiss Things
EarthQuaker Devices
Cheaper alternatives
Catalinbread Perseus
Catalinbread
46% similarityShared character: mono synth, tight tracking, one octave
Catalinbread Octapussy
Catalinbread
45% similarityShared character: mono synth, tight tracking, one octave
Pigtronix Octava Micro V2
Pigtronix
44% similarityShared character: tight tracking, one octave, fuzz
EarthQuaker Devices Bit Commander
EarthQuaker Devices
42% similarityShared character: mono synth, tight tracking, one octave
Similar character
Beetronics Swarm Fuzz Harmonizer
Beetronics
57% similarityShared character: mono synth, tight tracking, one octave
Pigtronix Octava
Pigtronix
56% similarityShared character: tight tracking, one octave, mix
Pigtronix OCT2
Pigtronix
55% similarityShared character: tight tracking, one octave
Beetronics Vezzpa
Beetronics
53% similarityShared character: extreme settings, tight tracking, one octave
Fairfield Circuitry The Unpleasant Surprise
Fairfield Circuitry
51% similarityShared character: extreme settings, mono synth, one octave
MXR M103 Blue Box
MXR
47% similarity“expanding on MXR's classic Blue Box with four independently controllable octave voices”
See all alternatives to the MXR Poly Blue Octave (cheaper + boutique) →
Questions people ask
What are good alternatives to the MXR Poly Blue Octave?+
The closest matches in character are the Beetronics Swarm Fuzz Harmonizer, the Pigtronix Octava, the Pigtronix OCT2. Budget picks: Catalinbread Perseus, Catalinbread Octapussy, Pigtronix Octava Micro V2.
What pairs well with the MXR Poly Blue Octave?+
Strong matches from rig and tone-complementarity evidence: Magnatone 280, Gibson Les Paul LP-1 Preamp, Magnatone 510 — Run fuzzy into Magnatone 280 for more modulated on top.
How much does the MXR Poly Blue Octave cost?+
Around $213.71 (live listing price, updated Oct 24, 2026).