The MXR Poly Blue Octave is an MXR fuzz pedal, currently around $235.99. Close alternatives include the MXR M103 Blue Box and the T-Rex Octavius. 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.
- octave
- modulation
- fuzz
- tracking
- stage
- mono
- mix
- synth
Price updated Aug 27, 2026
Genres the MXR Poly Blue Octave is commonly used in
- Experimental
- Stoner Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Shoegaze
cited
Inferred from shared tonal signals, not a stated genre tag. - Noise Rock
cited
Inferred from shared tonal signals, not a stated genre tag. - Ambient
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 MXR Poly Blue Octave
Pedals that stack with the MXR Poly Blue Octave
Cordovox PH-8
Cordovox
21% matchRun Cordovox PH-8 after MXR Poly Blue Octave in the signal chain, clear of MXR Poly Blue Octave's own gain stage
Walrus Audio Ages
Walrus Audio
18% matchWalrus Audio Ages layers clean boost onto an already fuzzy signal
Fender Blender
Fender
18% matchPut Fender Blender in front and the fuzzy tone leans further toward octave
Pigtronix Echolution
Pigtronix
12% matchKeep Pigtronix Echolution 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)
Walrus Audio Melee Wall of Noise Black
Walrus Audio
12% matchKeep 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)
Jackson Audio Bloom V2 Compressor/EQ
Jackson Audio
10% matchJackson Audio Bloom V2 Compressor/EQ leans toward transparent, and that's a real, usable character to pair with
SolidGoldFX Oblivion
Solidgoldfx
tonal matchSolidGoldFX Oblivion layers octave onto an already fuzzy signal
Caroline Guitar Company Parabola State Tremolo
Caroline Guitar Company
tonal matchCaroline Guitar Company Parabola State Tremolo layers clean boost onto an already fuzzy signal
Cheaper alternatives
Tru-Fi Super Fuzz PBF Compact Version
Tru Fi
67% similarityShared character: one_octave, fuzz, mix
Fulltone OF-2 Octafuzz
Fulltone
65% similarityShared character: one_octave, fuzz, mix
Dunlop MXR SUB Machine
Dunlop
64% similarityShared character: mono_synth, tight_tracking, one_octave
Pigtronix OCT2
Pigtronix
93% similaritysimilar tone character
Catalinbread Perseus
Catalinbread
92% similaritysimilar tone character
Catalinbread Octapussy
Catalinbread
92% similaritysimilar tone character
Boutique & premium upgrades
Similar charactersee all similar tone character →
MXR M103 Blue Box
MXR
70% similarity“expanding on MXR's classic Blue Box with four independently controllable octave voices”
T-Rex Octavius
T Rex
66% similarityShared character: tight_tracking, one_octave
EarthQuaker Devices Life Pedal V3
EarthQuaker Devices
65% similarityShared character: one_octave, fuzz, mix
Black Arts Toneworks -Fnord
Black Arts Toneworks
65% similarityShared character: tight_tracking, one_octave, mix
Beetronics Swarm Fuzz Harmonizer
Beetronics
95% similaritysimilar tone character
Beetronics Vezzpa
Beetronics
94% similaritysimilar tone character
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 MXR M103 Blue Box, the T-Rex Octavius, the EarthQuaker Devices Life Pedal V3. Budget picks: Tru-Fi Super Fuzz PBF Compact Version, Fulltone OF-2 Octafuzz, Dunlop MXR SUB Machine. Boutique upgrades: Suhr Thornicus Ian Thornly Signature Fuzz.
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, Cordovox PH-8 — Run fuzzy into Magnatone 280 for more modulated on top.
How much does the MXR Poly Blue Octave cost?+
Around $235.99 (live listing price, updated Aug 27, 2026).