Riddle

Envelope Filter for Guitar
The Electro-Harmonix Riddle is a powerful and precise envelope filter fine-tuned for guitar frequency response.

Sculpt your envelope to reveal a truly expressive tone, with a defined and unique signature. Riddle will deliver tight and smooth control over the complete 80 Hz to 5 kHz range, with a consistent and even sweetness.

Need some edge? Engage Riddle's analog distortion and dial in anything from subtle bite to dominating crush.

You can even plug in an optional expression pedal to control the filter sweep with your foot. With the ability to adjust Q, sweep range, and filter type, you'll also wind up with of the most versatile wahs available.

Riddle: a mysteriously musical envelope filter for guitar.


Featured Videos
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From the Blog
Posted 7/10/2013


Benjamin Harrison plays tenor through an EHX Riddle: Q-Balls. The Riddle’s filter sculpting adds a funky vibe to his saxophone.


Posted 9/27/2011



Legendary guitarist, Elliott Randall, demos the EHX Riddle Q Balls Envelope Filter for Guitar. Randall’s solo on Steely Dan’s “Reelin’ in the Years” is considered one of the greatest of all time!

Posted 7/6/2011



Bill Ruppert is a Jedi Master at the art of creating soundscapes that are truly not of this world. Travel along with Bill, into the astral plane, as he explores the outer limits of “Paranormal Guitar Effects.” In this latest edition of Effectology, Bill once again uses “only” his guitar and Electro-Harmonix effects pedals to conjure aliens, poltergeists and more!

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!

Posted 11/9/2010

Here’s a great special effect that’s perfect for an intro or guitar break within a song.

Nothing is more dramatic to the human ear than a drastic instant shift in sound frequencies.

Going from a full-bodied guitar sound to one that sounds like it’s being blasted out of a two-inch speaker in a transistor radio is a perfect way to accomplish this.

The Riddle pedal produces this sound via its high pass filter. A high pass filter allows only the upper frequencies to be heard while chopping off the bottom or low end. This mimics the sound of a very small speaker.

Using the Riddle onboard distortion creates the overdrive effect of a small pocket radio turned up just a little too loud. Turning up the sensitivity knob even further will produce the sound of a transistor radio with its battery ready to die.

Click the link below to hear a track sample:
EHX Tone Tips #2 Audio Track

Breakdown of the track:
1. Dry unaffected guitar
2. Transistor radio effect on
3. Full band entrance-fade

The full band sound used the following pedals:
Guitars- English Muffin
Bass- Guitar into a Octave Multiplexer and a Bass Big Muff.

Previous Tone Tips posts:

Stay tuned, more Tone Tips posts coming soon!

Posted 10/29/2010

Posted 9/28/2010

Posted 7/6/2010

Posted 4/28/2010

Posted 3/14/2010

In Effectology 14, pedal guru Bill Ruppert takes us on a journey to previously unchartered sonic territory. Using only Electro-Harmonix pedals and his guitar, Bill creates a series of “believe it or not” soundscapes. Whether it’s the sound of songbirds singing joyfully by a babbling brook or a vintage vinyl “lo-fi” recording complete with clicks and scratches, Bill’s mastery of effects will amaze you. As he says, “Never judge what an effect pedal will do by what you have heard it will do. Experiment and you will find new sounds not yet discovered!” Indeed!

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!

Posted 7/8/2009
Meet Riddle & Enigma: powerful and precise envelope filters, fine-tuned for guitar and bass. To read about their origins (which date back to 1972) see this post. And a kind thanks out to Jack Conte for the videos.

Riddle, tuned for guitar: (have fast Internet? watch in HD)

Enigma, tuned for bass: (have fast Internet? watch in HD)

Posted 6/18/2009
Can you crack the code of Riddle & Enigma?

First clue: Mike Beigel landing EHX color in the remote ice fields of Cape Crozier, Antarctica.

Years earlier, back in 1972, Mike also explored new sonic landscapes as inventor/engineer of the world's first stand-alone envelope filter, the Mu-Tron III. The sound was quickly captured by Stevie Wonder, and made famous by his 1973 funk classic, "Higher Ground."

Here's a vintage 1973 performance:

Despite Stevie's personal endorsement (see right) and other noteworthy users like Bootsy Collins and Jerry Garcia, the maker of the Mu-Tron III (Musitronics) closed shop in 1978. Years later, Mike Beigel decided to bring the original Mu-Tron III mojo over to EHX. Mike picks up the story:

"In '94 I met [EHX founder] Mike Matthews at a NAMM show. We talked about effects pedals, and later he asked me if I'd be interested in re-creating the Mu-Tron III for Electro-Harmonix. The new box which is called the Q-Tron, uses the same opto-electronic design of the Mu-Tron III, with new features and improved specs."

Mike and Mike went on to design the EHX Q-Tron, Q-Tron Plus, Micro Q-Tron, Stereo Polyphase, Bi-Filter -- and now, Riddle & Enigma: mysteriously musical envelope filters for guitar and bass.

What about Antarctica? In that same year (1994) Mike Beigel was also hired to design and build a system to track penguins between their nests on the beaches of Antarctica and their aquatic feeding territories. Mike later traveled to Antarctica to install and troubleshoot his system, and remembered to pack his EHX t-shirt. Mike adds: "And yes, I did work on some EHX designs during my spare time in Antarctica!"

While there, Mike also managed to capture amazing photos of the locals:

Riddle & Enigma: welcome to the family.

Submissions to EHX.com
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Quick Specs
80 Hz to 5 kHz frequency response tailored for guitar
Optional expression pedal control
Fully-analog circuit
Switch selectable analog distortion designed for guitar
Start and Stop sweep control
Low Pass, Band Pass, High Pass filter select
Start and Stop for filter sweep and Q control
Separate Dry and Effect outputs
9.6VDC 200mA power supply included
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