An elusive classic

An unsung hero in the world of modulation effects.

A rare gem that’s renowned for its mysterious complexity. Flanger BL-20’s hardware predecessor may not be a household name, but its hypnotic sound and radical feature set speaks for itself.

Toggle and combine multiple modulation sources, manipulate the LFO shape and stereo spread, plunge harmonic sweeps to uncharted depths. Flanger BL-20 is no ordinary analog emulation - it’s an FX toolkit gone supersonic.

3 modulation sources

Choose between Auto (LFO), Env (internal or external) or Manual, or any combination of the 3, for an array of flanger sounds unlike anything you’ve ever heard.

Stereo enhancer

Operate Flanger BL-20 in either mono or stereo mode, and manipulate the stereo spread of the modulated signal for ultra-wide presence in your mix.


Due to a tiny delay applied to the dry signal, the modulated signal doubles back over the original starting point, resulting in a classic deep flange with prominent ‘blips’ in the sound.

BBD warmth

Flanger BL-20 uses authentic bucket-brigade device circuitry replication to emulate the original unit’s gloriously warm analog response.

Advanced controls

Change the Auto LFO shape, tweak the stereo spread - we even added an advanced function generator from Pigments. Vintage charm meets cutting-edge.


A curated selection of 28 presets, giving you instant access to the energetic movement and analog brilliance of Flanger BL-20.

Reaching absolute zero

The flanger effect is achieved by modulating a delayed version of your signal using an LFO. Flanger BL-20 expands this principle in multiple directions.

By applying an undetectable delay to the dry signal, the modulated signal is able to reach - and eventually pass over - the original starting point of the signal. This totally cancels out certain frequencies - resulting in distinct dips in the sound. This is known as ‘zero-crossing’ or ‘through-zero’ flanging, perfect for that dynamite ‘80s guitar sound.

Finally, the option of multiple modulation sources gives Flanger BL-20 a uniquely animated quality. Use the default LFO, a responsive envelope follower, or a static manual override - there’s nothing quite like it.

Added sweetener

A crucial element of Flanger BL-20’s sound is the bucket-brigade device circuitry emulation.

We meticulously replicated this circuitry in virtual form to ensure a pristine analog response. Not only does BL-20 offer mind-blowing modulation capabilities - it adds that desirable vintage sparkle that plugins often lack.

This makes it a formidable mix sweetener, whatever your style. Enhance your rhythm guitar parts, animate your backing vocal tracks, enrich a repetitive drum loop; whatever your application, it will simply sound better.

Advanced controls

Flanger BL-20 goes far beyond the familiar flanger principles, retrofitted with cutting-edge functions and parameters to encourage a little healthy exploration. Modulation let loose.

Tim Bazell

Artists Corner

This is the first one I’ve heard that instantly gave me the feeling of a piece of hardware I’ve owned for years. I’m having so much fun using it and remembering just how creative and fun this unit can be.
Tim Bazell
( Mix Engineer )
Thiago Baggio

Artists Corner

I never thought I’d say that but Arturia changed my mind about using a flanger and I have been experimenting with it in every single track every single day whether I’m mixing or recording a new project.
Thiago Baggio
( Recording & Mixing Engineer )
Mark Bowen

Artists Corner

Despite Flanger BL-20 being an emulation of a near-mythical bit of old-school outboard gear, it has some versatile tricks up its sleeve.
Mark Bowen

Advanced controls

Flanger BL-20 goes far beyond the familiar flanger principles, retrofitted with cutting-edge functions and parameters to encourage a little healthy exploration. Modulation let loose.

Animate your DAW
with colorful modulation

Whether you're going for psychedelic sound design, warm analog response, or straight-up stereo richness, our modulation FX will fit seamlessly into any setup or mix. These plugins are designed to integrate with all major DAWs, on both Windows and macOS.

Pro Tools

Logic Pro X

Ableton Live

FL Studio



Digital Performer

Studio One


Main Features

  • Ultra-flexible stereo flanger with enhanced controls
  • 3 combinable modulation sources: Auto (LFO), Env and Manual
  • Perfectly emulated BBD response for coveted warm sound
  • Arturia's advanced features enhancing the original unit:
    • Zero crossing effect for deeper and more prominent flanger sounds
    • Stereo Offset and Reverse Sweep controls for stereo spread manipulation
    • 12dB/oct Hi-pass filter on input signal
    • The addition of the Function Generator from Pigments, which can override the Manual modulation mode
    • Choose from 4 additional Auto (LFO) modulation shapes
  • LFO and Function Generator feature tempo sync rates
  • External envelope option for extra-responsive modulation
  • Mono and stereo plugin modes
  • A selection of 28 curated presets for instant iconic modulation sounds

Platform specifications

  • Windows: Win 8.1+ PC: 4 GB RAM; 2 GHz CPU.
    1GB free hard disk space
    OpenGL 2.0 compatible GPU
  • Apple: 10.13+: 4 GB RAM; 2 GHz CPU.
    1GB free hard disk space
    OpenGL 2.0 compatible GPU

Required configuration

VST 2.4 (64-bit), VST 3 (64-bit), AAX (64 bits with PT 11), Audio Unit (64-bit), NKS* (64-bit DAWs only).

VST 2.4


The software is protected by the Arturia Software Center. You can learn more about it here.

*NKS compatibility coming soon

All manufacturer and product names mentioned on this page are trademarks of their respective owners, which are in no way associated or affiliated with Arturia. The trademarks of other manufacturers are used solely to identify the products of those manufacturers whose features and sound were studied during the development. All names of equipment, inventors, and manufacturers have been included for illustrative and educational purposes only, and do not suggest any affiliation or endorsement by any equipment inventor or manufacturer.