Stereo Polychorus Analog Chorus/Flanger/Slapback Echo

NOW IN THE NEW AND IMPROVED DIE CAST CHASSIS
The final word in analog chorus pedals. The classic that Kurt Cobain and Adrian Belew relied on to create their signature sounds. The Stereo Polychorus provides the lushest stereo chorus, rich chiming flange, and the over-the-edge effects that made this versatile pedal legendary.

Get the most out of your Stereo Polychorus with these suggested settings!

Click on the links below to see the different settings:

Polychorus Settings 1
Polychorus Settings 2
Polychorus blank template for your own settings
Below is a short demo of the above settings:


Featured Videos
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From the Blog
Posted 11/18/2013



Andy at Pro Guitar Shop shows how to get a Foo Fighters’ sound using the EHX Stereo PolyChorus and Big Muff Pi w/Tone Wicker.



These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 1/3/2012



The guys at Music Toyz kick off the New Year with a very tasty demo of the Stereo Polychorus. This classic Analog Chorus/Flanger/Slapback Echo is now in a new and improved die cast chassis.

This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 10/26/2011



Check out the new EHX XO Stereo Polychorus sounds and settings:

Polychorus Settings 1
Polychorus Settings 2
Polychorus blank template for your own settings
Below is a short demo of the above settings:

Learn more about this legendary analog flange/chorus which is now available in EHX’s rugged XO package.
https://www.ehx.com/products/stereo-polychorus

This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 5/12/2011



Save the Whales, a non-profit educational organization established to educate children and adults about marine mammals, their environment and their preservation, was founded in 1977. Today, May 12, is “Sing to Save the Whales Day.” Visit www.savethewhales.org  to learn more about the work they do. This is Trucotrampa’s new video “Singing like a whale”

From the Blog
Posted 2/14/2011


Through the magic of Bill Ruppert, Mr. Effectology, and Electro-Harmonix, take a mini-vacation and relax to the soothing sounds of the ocean and a steel drum band!! Once again, Bill Ruppert shows you how to achieve more than you ever thought possible with “just” a guitar, EHX effects pedals and a large dose of creativity.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 11/30/2010


Bill Ruppert rises to the challenge in recreating one of the most respected musical instruments of the 20th century, the Modular Moog synthesizer. Using only EHX pedals, Bill reproduces analog filters, specific ADSR enveloping as well as the sweeping modulations that redefined the way people think about tonal creativity.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Moog is a trademark of Moog Music, Inc.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 11/19/2010

Nirvana was one of the most successful alternative rock bands in the 1990s. The band was formed by singer/gutarist Kurt Cobain in Aberdeen, Washington. Two of Kurt Cobain’s favorite effect pedals were the Electro-Harmonix Small Clone and Polychorus.

Kurt Cobain

Here is the actual Polychorus used on the album In Utero.
The Polychorus was featured on the tracks “Heart-Shaped Box” (solo), “Radio Friendly Unit Shifter,” and “Scentless Apprentice.”
Shown below is the actual Polychorus used by Cobain, and his handwritten notes on settings.

Stereo Polychorus

 Hand Notes

The EHX Polychorus has since been reissued with the controls in slightly different positions.
If you own a reissue Stereo Polychorus make sure to adjust the settings above.

The Stereo Polychorus is capable of producing not only subtle flanging and chorus effects but wild over-the-top sonic mayhem as heard in the Nirvana song “Radio Friendly Unit Shifter.”
The settings below are for that song using a reissue Stereo Polychorus.
To help capture the sound, place the chorus before distortion or overdrive.

Stereo Polychorus

Previous Tone Tips posts:

Stay tuned, more Tone Tips posts coming soon!

This pedal was conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 8/16/2010

Classic analog gear, known for organic tone shaping, adds to the foundation for the new blockbuster Leonardo DiCaprio film INCEPTION. The Electro-Harmonix Stereo Polychorus sweeps its evolving and dense textures joining up with classic rack modules to define the dreamframe moment.

image capture showing the Stereo Polychorus

Inception ad

Link to movie website
http://inceptionmovie.warnerbros.com/

Creating the sounds of dreams featuring supervising sound editor and sound designer Richard King, Re-recording Mixer Lora Hirschberg, and Re-recording mixer Gary Rizzo.

Movie Studio:
Warner Bros. Pictures

Directed by:
Christopher Nolan

Original Music by:
Hans Zimmer
Johnny Mars

Movie Synopsis:
Dom Cobb (Leonardo DiCaprio) is a skilled thief, the best in the dangerous art of extraction: stealing valuable secrets from deep within the subconscious during the dream state when the mind is at its most vulnerable. Cobb’s rare ability has made him a coveted player in this treacherous new world of corporate espionage, but it has also made him an international fugitive and cost him everything he has ever loved. Now Cobb is being offered a chance at redemption. One last job could give him his life back but only if he can accomplish the impossible—inception. Instead of the perfect heist, Cobb and his team of specialists have to pull off the reverse; their task is not to steal an idea but to plant one. If they succeed, it could be the perfect crime.

From the Blog
Posted 12/8/2009

Welcome to the eleventh installment of EHX Effectology. Bill’s shimmering tones and lush string pads aptly demonstrate the powerful potential that all Electro-Harmonix pedals have. From gorgeous, glassy creations to an elegant legato string section, Bill delivers classic sounds that rival some of the finest studio gear. All sounds were created with one talented guitarist and the perfect interaction of Electro-Harmonix pedals.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 10/27/2009

Welcome to the sixth installment of EHX Effectology. See how only using EHX pedals you can recreate the wonderful Mellotron tones of Strawberry Fields Forever. Another brilliant “Effectolology” creation by Bill Ruppert.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 10/7/2009

The great Bill Ruppert creating remarkable collection of sounds.

Please note: Bill will be in the EHX Forums to discuss his sounds, settings, and process. We hope you join us there.

Previous episodes:

Stay tuned, more Effectology episodes coming soon!

These pedals were conceived of and designed by EHX from globally sourced components. Every EHX pedal goes through a stringent testing process by musicians and technicians in NYC before packing.

From the Blog
Posted 10/5/2008
Adrian Belew (King Crimson, Frank Zappa, David Bowie, Talking Heads, etc.) knows where to stick his Polychorus -- on a pedestal! Special thanks to Fender&EHX4ever over on the Harmony Central forums for the find!

From the Blog
Posted 8/29/2008
Here's a short experimental video by Radiohead's Thom Yorke -- look carefully, and you'll spot his Frequency Analyzer, Stereo Polychorus, and Big Muff Pi.

From the Blog
Posted 2/20/2007
On the 40th anniversary of Kurt Cobain's birthday, from the vault: playing his Small Clone and Polychorus.

Submissions to EHX.com
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Quick Specs
Mode selectable analog effects: chorus, flange, double track and filter matrix
Double track is a short slapback echo
Filter matrix mode disengages the sweep flange adjustment for manual flange tones
All effects have control over feedback and tune/delay
Sweep filter switch
Stereo outputs
9.6DC-200 power supply included
Dimensions in inches: 4.75 (w) x 5.75 (l) x 2.5 (h)
Dimensions in mm: 146 (w) x 121 (l) x 64 (h)
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