Chorus & Modulation

Strymon Mobius Modulation
Infinitely Organic.
Some might say we're driven. When our engineers lock themselves in our sound design labs for months on end, you might say we're obsessed. We have been dedicating ourselves to forging a collection of the most organic, luscious, expressive, and versatile modulation effects ever heard. It was an enormous mission—we painstakingly studied the nuances of the legendary modulations of celebrated tremolo effects, phaser pedals, chorus units, and more from the last five decades. We didn't stop at faithfully capturing these warm and lush vintage sounds—we expanded their vocabulary with extended versatility and sonic possibilities never before heard.
Mobius gives you twelve legendary, versatile, and inspirational modulation machines, all in an easy-to-use package. Go from lush, mouthwatering, vintage chorus sounds all the way to syrupy psychedelic phasers. Get classic, pulsating tremolos all the way to warbling crushed bits. Mobius opens up the history books of music and provides new sounds and inspiration for all of your musical ideas.
We knew we must surpass what has been done—in sound design, audio quality, hardware design, and processing power. Utilizing an insanely powerful SHARC DSP, every drop of power is harnessed. Top it all off with 200 presets, full MIDI implementation and a unique Pre/Post Mode and you're on your way to modulation ecstasy.
- Studio-class modulation algorithms deliver meticulous and detailed modulation experiences
- Twelve modulation machines to choose from: Chorus, Flanger, Rotary, Vibe, Phaser, Filter, Formant, Vintage Trem, Pattern Trem, Autoswell, Destroyer, Quadrature
- Five front-panel tone shaping knobs: Speed, Depth, Level, Param 1, Param 2 (Param knobs assignable per preset)
- Additional menu-driven parameters deliver extremely flexible tone shaping options and versatility
- 200 easily accessible and nameable presets, save and recall at the press of a switch
- Three rugged metal footswitches for preset selection, effect bypass, and Tap
- LED display for preset info, BPM readout, and extended parameter control
- Full MIDI implementation allows extended control for those with more complex rigs
- Sturdy and lightweight dark blue anodized aluminum chassis
- Stereo input and output
- Expression pedal input with selectable control over any knob or combination of knobs, saveable per preset (also configurable as external tap input)
- MIDI input and output
- Pre/Post Mode for flexible routing, allowing you to put Mobius in two different places in your mono signal chain
- Ultra low noise, high performance 24-bit 96kHz A/D and D/A converters
- 110dB typical signal to noise
- 20Hz to 20kHz frequency response
- +8dBu maximum input level easily handles instrument and line signals
- Premium analog front end and output section
- Super high performance DSP in a compact form factor
- 32-bit floating point processing
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Price: $449.00
Strymon OLA Dbucket Chorus and Vibrato
Certified Organic.
When we set out to design Ola dBucket Chorus and Vibrato, we knew that we wanted to take a high-performance SHARC DSP and dedicate all of it's horsepower to doing one thing—providing the most lush and organic chorus and vibrato sounds ever heard. Our hand-crafted, processor-intense dBucket algorithm delivers all of the warmth and sonic complexities of analog choruses and vibratos. We drew influence from some of our favorite vintage chorus effects and a certain little blue box vibrato with a strong cult following. Couple that with true bypass, a favorite preset, stereo input and output, and a super high quality analog front end and output section, and you have yourself a versatile chorus and vibrato workhorse.
- Hand crafted dBucket algorithm for highly accurate reproduction of every stage of an analog bucket brigade chip. Built on the dBucket building blocks developed for our Brigadier delay.
- Super low noise, high performance A/D and D/A converters w/ 110dB signal to noise
- High performance DSP stuffed into a compact form factor
- 3 modulation types (chorus, muti-mode chorus, vibrato)
- 3 dynamic modes (normal, ramp, envelope)
- Controllable ramp speed | envelope sensitivity
- Global tone control for the overall color of your modulation
- Mix control for dialing in various modulation intensities
- TRUE BYPASS (electromechanical relay switching)
- Stereo input and output
- Favorite footswitch for saving your favorite setting
- Powered with a standard 9V center negative DC supply. Compatible with all major DC supply brands. Current consumption 200mA – (250mA recommended supply)
- Premium analog front end and output section
- No-nonsense user interface
- Strong and lightweight blue anodized aluminum chassis
- Crafted with love in the USA
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Price: $299.00
Strymon Ultraviolet Vintage Vibe Pedal
Quintessential Vibe A warm grittiness to the warble, a rippling, wooshing, bubbling irregularity to the modulation and a dynamic response to your picking are all hallmarks of the true vibe experience.
Thicker and chewier than any chorus, earthier than any phaser and uniquely magical in front of a driven amp, the perfect vibe pedal moves you to dig in and play without inhibition.
This feeling has been difficult to find outside of large and expensive fully-analog boutique units, but the search for that elusive experience is now over.
Delivering vintage vibe tone that’s second to none with simple and powerful controls for instantly obtaining a rich variety of captivating sounds, UltraViolet is the vibe pedal you’ve been looking for.

Price: $259.00
Strymon Zelzah Multidimensional Phaser
Way Back Machine.
Step on Zelzah, play one chord, and you’re instantly taken back to a world of classic phaser tones as they were always meant to sound, perfectly voiced, with tons of vibe. Vintage 4-stage and 6-stage phasing with controls that allow seamless transitions to vibrato, gorgeous flanging and chorus, and new sounds never heard before—all instantly musical with great tone all the way across every dial.

Two Effects At Once. Zelzah is actually two different phasers, side by side in one pedal. Zelzah’s 4-stage side gives you a wide array of classic tones ranging from phasing to vibrato and more, while the 6-stage side provides phasing, flanging, chorus, and all points in between. Dial in a chorus on one side and barber pole phaser on other, or a phaser on one side and tremolo on the other. Use the two sides independently or together in a variety of configurations. Zelzah may become the only modulation pedal you keep on your board.

Price: $349.00
Universal Audio Astra Modulation Pedal
Taking you deep down the rabbit hole of classic analog modulation, UAFX Astra Modulation Machine serves up the most sonically authentic bucket-brigade chorus/vibrato, studio flanger/doubler, and tube-driven tremolo effects ever placed into a single stompbox.
Built upon our powerful new UAFX dual-engine processing and unmatched levels of quirky analog realism, Astra delivers richly addictive vintage modulation, beautifully crafted to inspire you for decades.
Chorus Brigade: Iconic Japanese Modulation
Upon its release in 1976, this legendary gray bucket-brigade stompbox changed the sound of music with its thick, luxuriant chorus and wavy vibrato. Astra's Brigade Chorus mode gives you the most complete circuit emulation of this landmark unit — including its preamp section for authentically thick, saturated sounds — letting you paint with subtle ripples of analog texture and tone, adding chewiness, shimmer, and motion to everything you play.
Flanger/Doubler: A Rackmount Studio Classic
Packed with late-'70s bucket-brigade tech, this classic rackmount studio flanger/doubler is famous for stunning whoosh effects, organic thickening, and a parade of wild sounds that go way beyond typical flanger boxes. Astra's Flanger/Dblr effect is the only end‑to‑end circuit emulation of this ultra‑rare unit, capturing its original features to a "T" and putting impossibly dense, complex flanging/doubling right at your feet.
Trem 65: Authentic Tube Amp "Shake"
Few things compare to the optical tube-driven tremolo of '60s American amplifiers. Deep, undulating, and the very essence of vibe, Trem 65 is a faithful emulation of this classic circuit. From shimmering ripples to choppy mayhem, every dynamic detail is captured in UA style, down to the complex interactions between the light source photoresistor and 12AT7 driver tube. Plus, you can explore further and create your own trem textures with variable sine and square wave settings.
Dual Stereo Modulation Engines for Endless Creativity
Astra's UAFX engine powers separate stereo instances of each modulation effect, thanks to its unique dual‑engine processing. It's like having two bucket-brigade hardware units running simultaneously — or even dual tremolo circuits — giving you a full stereo spread of complex, jaw‑dropping textures.
A State-of-the-Art Stompbox
With modern, high‑powered features like studio‑grade conversion, dual‑processing engines, additional downloadable effects at registration, Live/Preset modes, true/buffered bypass,* and silent switching, Astra Modulation Machine has your colors — now go forth, and paint your masterpiece.

Regular Price: $499.00

Guaranteed Best Price: $399.00
Warm Audio Jet Phaser 6-Mode Phaser Guitar Pedal with Built-in Jet Fuzz Circuit
The seventies were an amazing time, as bell-bottoms, chains and afros dominated the fashion scene and the swoosh and swirl of phaser effects were everywhere on the radio. From the guitar work of David Gilmour, Brian May and Eddie Van Halen to the trail-blazing keyboard stylings of Steely Dan, Herbie Hancock and Paul Simon’s Richard Tee, it seemed like everyone was incorporating phasers into their sound.

Of all of the designs available during that time period, one phaser pedal stood apart from the others due to its flexibility, sound quality and addition of fuzz sounds, and it was immediately adopted by funk bass pioneer Larry Graham as the core of his modulated sound with both Sly and The Family Stone and his own Graham Central Station.

The Warm Audio Jet Phaser is a hyper-authentic recreation of this famous pedal, accurate from the gooey swirl of the audio circuit to the look and feel of the enclosure, except that it’s true bypass and far more affordable and reliable than vintage units!

The Jet Phaser contains six modes, with two labeled "PHASE" and four labeled "JET". The two PHASE modes produce traditional phasing effects, with the first having moderate modulation depth for more subtle sounds, and the second having increased depth for more exaggerated results.

However, the similarities to normal phase pedals end there. The four JET modes engage the "jet" (or fuzz) effect, and that's when things get seriously fun!
- Bright fuzz/shallow phase
- Bright fuzz/deep phase
- Dark fuzz/shallow phase
- Dark fuzz/deep phase
When the JET modes are active, the pedal's output level is controlled by the JET LEVEL knob. This enables you to set up the JET modes as a boost, if desired—which could be perfect for solos!

The Jet Phaser also features a RESONANCE control that's available in all six modes, allowing you to dial in varying amounts of filtered sci-fi craziness. Additionally, you get creative control of the modulation rate: the SLOW RATE knob allows you to set the main modulation speed, but hitting the FAST/SLOW foot switch always kicks the rate up to the maximum speed possible. It’s a cool design, because the change from fast to slow ramps up and down gradually like an organ’s rotary speaker. Unlike most phasers, the Jet Phaser can actually get “in-between” speeds by continuously hitting the FAST/SLOW foot switch like organ players do!

The Jet Phaser’s true bypass operation makes it easy to incorporate into any rig, and the fact that it runs at 18V gives it high headroom and pristine audio quality (it can be powered with the included 18VDC adapter or two 9V batteries). We already know it'll sound great on guitar, bass, and keys, but don't let that stop you from slapping it on a vocal track or a drum bus - use your imagination!
- FAITHFUL RECREATION OF THE ORIGINAL “JET” PHASE CIRCUIT
- USES PREMIUM COMPONENTS THROUGHOUT, INCLUDING CARBON FILM RESISTORS AND FILM CAPACITORS
- TRUE BYPASS OPERATION
- SIX MODES: JET (1–4), PHASE (1–2)
- EFFECT/NORMAL AND FAST/SLOW FOOT SWITCHES
- JET LEVEL, MODE, RESONANCE, AND SLOW RATE KNOBS
- GRADUAL RATE CHANGE WHEN FAST/SLOW SWITCH IS PRESSED, SIMULATING A ROTARY CAB
- 1/4" INPUT (INST) AND OUTPUT (AMP) JACKS
- DC ADAPTER/BATTERY SWITCH
- RUGGED STEEL CHASSIS WITH ATTRACTIVE WOODEN SIDE PANELS
- POWERED BY TWO 9V BATTERIES OR 18V DC ADAPTER (INCLUDED)
- POWER CONSUMPTION: 9MA
- LENGTH: 10.25"
- WIDTH: 6.5"
- HEIGHT: 2.5"
- WEIGHT: 4.6 LBS
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Price: $199.00
Warm Audio Mutation Phasor ll Electro-Optical Phase-Shifting Pedal With Feedback Circuit
The Warm Audio Mutation Phasor II is an accurate recreation of one of the most desirable,100% analog phaser circuits made famous in the experimental era of the 1970s. Mutation Phasor II has all of the vintage vibes of the original phaser pedal allowing you to add depth, wobble, swirl, or “instant funk” to guitar, keys, bass, or anything you can dream of. This electro-optical phase-shifting pedal is built with a true-to-spec recreation of the 70s circuit using premium components. True to the original pedal, Mutation Phasor II delivers all the rich depth and instant psychedelic tones, favored by innovative musicians and producers like Billy Corgan, Tom Bukovac, Robin Trower, and many more.

Adding the Mutation Phasor II to your rig is like adding a new instrument. Fine-tuning the depth of the modulation just right and timing the speed to sync perfectly with the tune takes you back to old-school gigging and recording. For those looking for a truly unique phaser experience, send the phase shifts into overdrive by dialing up the feedback, emphasizing the “wooshes” of the pedal. Altogether, the Mutation Phasor II is not just a pedal, but more of a tone-shaping experience.

A true-to-original recreation of the 70s circuit, Mutation Phasor II is built with premium components including classic RC4558P op-amps, vintage-style diodes, carbon resistors, and film caps - Housed in an ultra-tough, vintage-vibe steel case.

To deliver an authentic, experimental experience, the Mutation Phasor II brings back all of the original controls. For ultra-rich swirly phase shifting, the “Depth” control allows you to vary the width of the sweep range - delivering deep modulation expected from a vintage all-analog pedal. Increasing the depth control adds width to the frequency range of the effect, impacting higher highs and lower lows. Easily change the speed (or rate) of the phase-shifting effect to create more or less “wobble” in your tone - from 1/10th sweeps per second (slowest) to 18 sweeps per second (fastest). Increasing the “Feedback” control adds electric feedback to the “wet” phase-shifting signal. Increasing the feedback control creates a more intense phase sound with a particular emphasis on the sweeps, especially noticeable at slower rate settings.
- Electro-Optical Phase-Shifting Pedal With Feedback Circuit
- Phasing Rate: .1Hz - 18Hz
- Premium Components, Including RC4558P Op-Amps, Various Vintage-Style Diodes, And Hand-Selected Film Capacitors & Carbon Resistors
- Controls: Rate, Depth, And Feedback
- Frequency Response: 20Hz - 20KHz
- Min Feedback: 4V RMS, 11.2V Peak-To-Peak | Max Feedback: 2V RMS, 5.6V Peak-To-Peak
- Current Draw: 150 MA
- Buffered Bypass
- 9-Volt Battery Or External 9V Regulated DC Adapter (Center-Negative)
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Price: $149.00
Warm Audio RingerBringer Ring Mod
From light Lo-Fi modulation all the way to the piercing sound of infinity ring-modulation, the Warm Audio RingerBringer accurately recreates the ultimate all-analog ring modulation effect used for experimental tones. Like the original, loved by artists like Jeff Beck, Radiohead, Omar Rodríguez-López, Trent Reznor, and many more, RingerBringer delivers the original distinct set of controls, extensive in/out options, and rich sonic textures to inspire boundless sonic experimentation.

The ideal platform for the sonic tinkerer, RingerBringer inspires you to generate layered frequencies and harmonics, explore a wide range of sonic possibilities for guitar & beyond, and design your own sounds from the ground up. Extensive controls including LFO, MOD, Frequency & RATE open up sonic possibilities that range from subtle overdriven textures all the way to wobbling, warped leads soaked in texture and tone. RingerBringer is 100% analog and sports premium components including hand-selected op-amps and transistors. RingerBringer is no emulation or “patch”, instead it delivers true-to-spec performance of the boutique, analog original.

Delivering tones ranging from nuanced drive to out-of-this world modulation, Ringerbringer helps develop a unique sonic signature for any instrument, on any track.
- 100% Analog Ring Modulation Pedal With LFO, MOD, Frequency & RATE Controls
- Accurate Recreation Of The Ultimate Ring Modulator For Experimental Tones
- Premium Components Including LM13700M & TL072ACDR Op-Amps + Hand-Selected Transistors (DMMT3906W & MMBT3904) For True-To-Spec Performance
- LFO Controls: Amount, Rate, & Sine/Square Wave Switch
- Modulation Controls: Mix, Frequency, & Lo/Hi Switch
- Universal Drive Control + LED Indicators For Level, LFO, & Bypass
- CV Inputs: Rate | Amount | Mix | Frequency
- 1/4" Input Jacks: Audio In | Audio Out | LFO Out | Carrier IN/Out
- Output Impedance: 600 Ohms | Buffered Bypass
- 9-Volt Battery Or /External 9V Regulated (Center-Negative) DC Adapter
- Nominal Current Draw: 100 mA (9V)
- Custom Black Panel Enclosure With Retro Faux-Wood Sides
- Dimensions: 6.5” x 5.25” x 3” | Product Weight: 1.90 lbs
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Price: $219.00

Chorus & Modulation

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