SKU: 70704500397

MXR Poly Blue Octave Effect Pedal

Sale price$106.20 Regular price$118.00
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Description

MXR Poly Blue Octave Effect PedalWith upgrades in every feature and brand new sounds to explore, MXR and the Poly Blue Octave brings MXR's classic octave effects to the next level. With masterful pitch shifting already in MXR's area of expertise, the Poly Blue Octave shows how much further the experience can go. The Poly Blue Octave begins with four separate controllable octave divisions one octave up, two octaves up, one octave down, and two octaves down. Already, the experience at

With upgrades in every feature and brand new sounds to explore, MXR and the Poly Blue Octave brings MXR's classic octave effects to the next level. With masterful pitch-shifting already in MXR's area of expertise, the Poly Blue Octave shows how much further the experience can go.

The Poly Blue Octave begins with four separate controllable octave divisions – one octave up, two octaves up, one octave down, and two octaves down. Already, the experience at hand is technically advanced and functionally deep. Each octave division is polyphonic and features a dedicated knob to blend into the mix to preference. The Poly Blue Octave's polyphony makes both single notes and chords bloom with MXR octave beauty.

Extra functions build on this quadruple-octave effect pedal. The Poly Blue Octave's Mono switch will set the polyphony effect monophonic to replicate the single note grittiness of analog-style pitch shift effects. Fans of MXR will be familiar with these monophonic tones, from the sub-octave's MXR Vintage Bass Octave tones to the higher octave's Octavio Fuzz signal sounds without the fuzz effect. Those in need of a classic MXR fuzz effect, however, can rely on the Fuzz switch and its MXR Blue Box Fuzz-style buzz. This fuzz effect is applied to all four octave voices in addition to the dry mix control.

With multiple octave outputs and fuzz tones covered, the MXR Poly Blue Octave tacks on one last touch with its Mod control. The dual-mode modulation effect of the pedal can create rotary-style swirls a la Leslie speaker effects in polyphonic mode or sweeping waves like the MXR Phase 90 in monophonic mode. A Mod knob controls the speed of the modulation effect as applied to all five signals. Ease in Mod for colorful flourish or crank it to let the effect loose for absolute modulated craziness.

Expression connection through the EXP ¼" output allows for deeper interaction with the Poly Blue Octave's effects. The Dunlop Volume (X) 8 or the MXR Tap Tempo can be used to sweep between different knob configurations or toggle the fuzz or mono settings on and off – hands free.

With multiple effects equipped, the Poly Blue Octave carries a board's worth of pitch shifting, distorting, and modulating effects in a compact pedal. Functions for endless experimentation and effortless musicality make the Poly Blue Octave shine. Cutting-edge and imaginative, MXR and their mastery of octave effects strike again.

  • Four independent octave divisions
  • Dry mix control
  • Modulation mix / speed control
  • Switchable fuzz effect reminiscent of the MXR Blue Box Fuzz
  • Switchable monophonic and polyphonic octave effect modes
  • Expression pedal connectivity
  • True bypass switching
  • 9 Volt battery connection
  • 9 Volt DC power requirement - power supply included
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 70704500397

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4.9 ★★★★★
Based on 21 reviews
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Mary C. Lucking
Pawtucket, US
★★★★★ 5
PASSED MY INSPECTION! THIS PRODUCT WORKS LIKE A MIRACLE DONT HESITATE TO BUY IT!
Inspection on my car due the end of January! My check engine light was coming on so I checked with a code reader & found it was a P0420. Read about the Catalytic Converter System possibly being in need of replacement or perhaps clogged. I am a woman, and know next to ZERO about cars, but I can read. Did investigate and found that the replacement of a Catalytic Converter system is mad expensive- also found this Moly Cleaner to add to gas tank. I'm not going to lie; I was nervous as I have a Kia Rio 2014 that has a very small gas tank and gets great gas mileage. In reading the consensus seemed to be to add to 1/4 tank of gas and drive fast for good periods of time to blow out the clog (if it was a clog). Did I mention I live in NYC and driving for long periods of time at high speeds can be a problem because of terrible traffic. Anyhow, this Saturday I poured the can into my 1/2 filled tank and hit a parkway near my home early morning. I did drive for 45 miles sometimes at 80mph then 60mph but tried to do it for a good few minutes at a time without getting pulled over. Checked my reader again, and it was not quite ready but the engine light did stay off. Next day, drove to work, stuck in traffic somewhat & never made it over 20mph & checked my reader again- all good to go for inspection. Went last night- my car PASSED and got that sticker in my window- so I am good for another year. The BEST money I have spent all year. Thank you for carrying this product! Saved me thousands! DONT HESITATE TO USE THIS. The hardest part for me was removing the cap on the can!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 13, 2026
C
Verified Purchase
CLEVEinCR
Boise, US
★★★★★ 5
Great stuff
Seemed to work as well as or better than some more expensive catalytic converter cleaners. I put it in while at 1/3 tank and my Check Engine light went out almost immediately once I started driving. My Tundra has almost 230,000 miles and still runs great but was getting a little harder to start after I switched from full synthetic oil to conventional. I’ll never do that again and immediately switched back but the damage was done. Check engine light came on and I had to crank longer to get it started. Adding this Liquid Moly fixed both issues temporarily. I have to wonder if this was used regularly, say every 3 months, if it would clean the catalytic converter more permanently?
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Reviewed in the United States on December 29, 2025
J
Verified Purchase
Jon.
Bozeman, US
★★★★★ 3
Ehh??
Didn't work for my on my 17 hyundai accent with 90k on it. I poured the whole bottle in with a half tank of gas. And went for a 3 day italian tune up.... no dice.
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Reviewed in the United States on May 8, 2026
J
Verified Purchase
Juan Gonzalez
Massapequa, US
★★★★★ 5
Works great
Follow instructions and it will work. Had a p420 code, caught it early used this. No more code and passed emissions
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Reviewed in the United States on May 10, 2026
M
Verified Purchase
Matt Teed
Los Angeles, US
★★★★★ 5
Actually works on BMW!
I purchased this after the shorter black fluted tool I bought last year failed me. This thing is way better constructed, fits perfect , and actually works to turn it after you can’t turn it by hand any further. Was able to get torqued down to 25nm no problem finally with ease!
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Reviewed in the United States on November 12, 2024

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