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Antresol by D16 Group is a Virtual Effect Audio Plugin for macOS and Windows. It functions as a VST Plugin, an Audio Units Plugin, a VST 3 Plugin and an AAX Plugin.
Windows 7 or later
Mac OS X 10.13 to 13
Copy Protection
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Antresol brings in the classic Mistress stomp box back to life. The original, conceived in the mid-70s, quickly became a benchmark for flanger-type effects by offering a uniquely rich character. Antresol is a thorough incarnation of this classic and the newest effect in the SilverLine Collection.

An exceptionally accurate emulation of an impulse-controlled, solid-state analog delay line (a Bucket Brigade Device) is a center piece of Antresol. Its users are provided with absolute control over every aspect of the BBD-based delay line (including calibration of the linearity of the clocking system or the number of analog memory cells constituting the backbone of the BBD).

In addition to the standard parameter knobs found on the face of the original unit, there is also a wide range of deeper parameters available to tweak, such the on-PCB trimpots which would normally be inaccessible without taking the stompbox apart. Also fully controllable LFO (with adjustable phase and rate sync to a host application's tempo). The ability to unlink the stereo channels and control the most important parameters independently for left and right (or mid/side, depending on selected mode).

Key features:

  • True emulation of BBD based analog delay line.
  • Optional independent parameter control for each stereo channel.
  • Selectable L/R or M/S stereo processing modes.
  • Mistress mode allows the whole unit to work the same as the classic flanger.
  • LFO can be synchronized with your host application.
  • 3 different LFO-to-BBD clock curves.
  • Ultra-low aliasing output.
  • Highly musical and pleasant sound.
  • Tag-based browser.
  • Selectable GUI sizes.
  • MIDI-learn functionality throughout.
  • 64-bit internal processing.

Sound examples: SoundCloud.com/d16group/sets/antresol-demos

Latest User Reviews

Average user rating of 5.00 from 2 reviews

Reviewed By DJMaytag
July 6th, 2015

Bought it immediately, based on the reputation of their other Silverline Plugins. It's definitely a versatile box, with a nice smooth subtle flanging going on. I've never used the Mistress that this is based on, but I can confidently say that Antresol has a great sound and it can a great job of making a sound fit in the mix.

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Reviewed By tommyzai
June 26th, 2015

I'm a big fan of D16 Group and was thrilled to add this effects plugin to my collection. After several hours of noodling, I was inspired to write a little user review. My writing style reads a bit like an ad, but hopefully you find my findings useful. — Tommy Zai

Antresol by D16 Group is an accurate digital audio effects plugin re-incarnation of the legendary Electric Mistress flanger stomp box. I never personally owned or used the original analogue pedal, but my guitarist abused that thing back in the early 80s. Every time his foot clicked that button I knew that some cool filtering sweeps were on the way, and the tone was not lost in the mix, whether live or recorded. Antresol delivers everything the original offered. The only thing missing is having a button to physically step on. Otherwise, it's all there, plus some useful added features, including: Access to the on-PCB trimpots, a fully controllable LFO, stereo channel delinking, etc. For vintage purists, D16 has included a "Mistress Mode," which scales back the parameters to the original specs of the hardware model.

Although flangers of this nature have traditionally been used by guitarists, many eMusicians, producers, etc. (including myself) have found them to be extremely useful for synth lines and even drum loops. I dig the psychedelic sound, and a flanger is often one of my key ingredients. Actually, when used tastefully, I think a flanger can bring almost any kind of track to life by creating a subtle sweeping wave of movement. It can also be used in its extreme to create cool effects for a sustained hit or for breaks. One of the problems with hardware stomp boxes is the inherent noise. They usually have an unwanted cycling hum and are easily affected by the surrounding electromagnetic field. With Antresol, the tone is all there, but it's delivered with clarity regardless of how close your computer is to a fluorescent tube or lamp.

• Easy to install and authorize.
• User friendly interface.
• Shallow, if any, learning curve.
• Great preset collection.
• Sounds great — lush and smooth and has all the "luxuriously harmonious interacting resonances" of the original.
• CPU efficient.
• Stable and Reliable.
• Innovative developer.
• Good price.

• D16 always gives their software the most original names, which leads to my questions — What does "Antresol" mean?
• Bucket Brigade Device circuitry — Ah ha! After some research, I figured out what this is and how it helps.**
• Presets are excellent, and at the risk of being greedy — I hope future updates include even more.
• The blue/red version the Electric Mistress featured a "Filter Matrix mode" that allowed users to freeze it at any point in the flange, offering distinctive chime-like tones. Does Antresol have this feature? If not, I hope it's considered for future releases.
• I don't' know much about the engineering behind audio gear circuitry, but the "quasi-analog signal representation throughout" successfully emulates the original, physical circuit.

D16 Group has a long history of successfully bringing classic analog gear back-to-life, and like their other offerings, Antresol is right-on and stands on its own — emulation or not! It is warm and powerful like the hardware model, but with the added benefits of the modern musical production era and some bonus features. I highly recommend this classic flanger to any modern musician, producer, sound designer, film and game scorer, DJ, etc., who is looking for that vintage filtering swirl. Tommy Zai gives Antresol two sweeping thumbs up. Thank you, D16, for reviving this timeless effect and adding it to your SilverLine Collection.

Antresol is a really cool digital re-creation of a famous flanger stomp box, delivering everything the original offered and much more for just over $40. If you dig a timeless flanger that has been flawlessly re-animated, I think it's worth checking out the demo.

*Our guitarist was a huge fan of David Gilmour, Todd Rundgren, and Andy Summers of the Police, who each used the iconic flanger stomp box extensively.


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Comments & Discussion for D16 Group Antresol

Discussion: Active
17 April 2015 at 12:53pm

Yeah, cool... Flangers are still not very popular among developers. So I still miss a good one. Will test yours.

17 April 2015 at 5:11pm

This announcement makes my day!! There was already several products offering thinly disguised emulations of the Electro Harmonix's EM (eg. in the AmpliTube suite IIRC). But after ArtsAcoustic's Big Rock, which I happily purchased and used, I was for quite some time waiting for a product claiming to offer a /faithful/ (if not 100% perfect, like AA does with Big Rock -- D16 only states "exceptionally accurate", which to any neurotic nerdy and anal-retentive maniac might just not sound good enough) reproduction of the original Electric Mistress, in order to round up a set of essential Jarre-oriented effects. I had a couple of time asked to AA whether they'd consider doing to the EM what they already did for the Smallstone (could never even get a reply BTW, a shame -- although I know they are a very small company (smaller than D16 maybe?) and since I was not a customer but only a potential one, well...). Doesn't matter much now anyway! Looks like this fits the bill and will prolly be my next purchase... Thanks D16 for finally bringing an accurate Electric Mistress emulation (way too long expected stuff!!).

18 April 2015 at 7:05am

Looks and sounds like another winner for D-16 Group. Fantastic.

29 June 2015 at 10:43pm

D16 releases unique and useful plugins. This is a must buy for me.

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