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Chorus by XILS Lab

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Chor'X combines four types of Vintage Chorus effects, based on Bucket-Brigade Delay (BBD) emulation with a sophisticated True Stereo Dynamic Spatializer.

With this duo, it becomes very easy to add space , depth, and other dimensions to your instruments, and achieve complex and intriguing mixes.

The new Legacy/Advanced feature allows a fast workflow to choose and tweak your prefered chorus model.

You want only a standard famous chorus algorithm ? Keep the Legacy view, select your specific mode, that's all ! Just add a bit of space by moving the outputs in the Stereo field.

You want more, would like to change a bit the LFO rate or Amount of your chorus model ? Click on the Advanced button and change the Chorus parameter as you did with the previous Chor'X version.
The Four Bucket Brigade Delay Types (BBD): The Four Chor'X modes ( Synthex, CS-80 Dim-D and V+ 330 ) have been patiently modelled after closely studying many vintage chorus units and deciphering what made them unique.

They aim to present some of the most famous archetypal structures found in those famous vintage units : 4 BB Delays, 2 BB Delays and 2 BB delays with phase tweaks, with or without internal compander. By combing these distinct chorus types, you can create chorusing effects from the most graceful and smooth to completely wild.

But this was not enough!

The True Stereo Dynamic Engine (TSDE): Some Choruses were famous for the stereo width they could add to instruments.

We pushed the concept a bit further by offering a True Stereo engine, so that you can position all the signals in a stereo image. True Stereo doesn’t mean a simple panoramic tool, with our TSDE you can place an instrument in front of the stereo field or farther back : You master the Space !

To go a bit further: We added a few unique features, that you’re used to finding in all Xils-lab instruments, features with musical meaning and sense !

Impulse Threshold: The Chor'X will not destroy the low end of your instruments, like some standard Chorus, but we also added a special Dry tool, which will let you treat percussive material while leaving the transients dry, only adding chorus to the tail of the instruments.

Dynamic Modulations: You can add automatic dynamic changes to the rate and the amount of all the BB Delay lines. This unique feature is the key to everchanging very subtle or more devastating Chorus, and combined True Stereo effects.

And finally we packed all this in an intuitive and fast UI, with 2D pads wich allow a very precise tuning of parameters like the Chorus rates, amounts etc, instant visual feedback, and the true joy of seeing your stereo image moving while the balls are dancing to the sound of your music.

You can see complete details of the Chor'X features, hear some sound examples, and watch some videos in the following pages.


Chor'X 1.5 offers

  • Easy and Fast workflow with the Legacy/Advanced mode  
  • Four Bucket-Brigade Delay emulations
  • Four standard chorus structures (with special filtering and compander emulations)
  • Two 2-D pads for easy parameters tweaking
  • True Stereo Dynamic Engine
  • Advanced Dry/Wet modulation with an impulse follower
  • Advance Amount modulation with an envelope follower
  • True stereo path with independent Right and Left Chorus structures
  • Advanced preset management
  • All parameters are MIDI controllable

The Chor'X 1.5 provides four standard chorus structures you can choose by clicking on the Synthex, Dim-D, CS80 or V+330 buttons. These choruses are built with special filters and compander (compressor-expender) emulations to get as close as possible to existing old analog chorus unit.

“Synthex” structure, based on two BBDs and two LFOs per channel, several filters and an amplifier based compander emulation.

“Dim-D” structure, based on one BBD per channel and only one LFO dispatched in inverted phase to the left and the right channels. It features several filters and a chip base compander emulation.

“Cs80” structure, based on one BBD and two LFOs per channel, several filters. No compander is used in that structure but the left and right levels also depend on the LFOs.

“V+330” structure, based on two BBDs and two LFOs per channel, several filters and an amplifier based compander emulation.

Chor'X 1.5 in Legacy mode

Chor'X 1.5 in Advanced mode

Chor'X emulates up to four bucket-brigade delay (BBD) emulations, two for the left and two for the right channel. Each BBD is modulated in frequency and range, according to the position of the lights. For easy control, these 8 parameters can be tweaked in a advanced 2-d pad (but also in a standard dual concentric knob display by clicking on the Knob button). When a light is moved around in the 2-D area, the corresponding delay is modulated according to its position. Horizontal movement gives more or less amount, vertical movement gives more or less speed. Right clicking on a light allows moving all four lights together, keeping their relative position. The HISS knob can control some of the character of the bucket brigade delay, adding more or less hiss, noises and non-linearities.

Chor'X 1.5 offers a powerful stereo processing, the True Stereo Dynamic Engine,  allowing you to put your audio signal in a true stereo space. This is done in an easy and intuitive way as well as giving you a real stereo feeling.

You can process only the wet signal (the blurred lights) or, by clicking on the DRY button, also the dry signal.


When the Stereo ON switch is engaged, you have access to our Advanced Dynamic Stereo Engine MIC ANGLE sets the position of the microphones and WIDTH makes the space more or less wide. Moving the lights around the area gives you the right position for your sound. Right click allows you to keep the left/right balance identical. Clicking and moving the microphones allows you to open your stereo effect. As for the bucket-brigade settings, you can add chaotic movement to the stereo position of your wet signal, with AMOUNT and SPEED, Hrz and Vert allowing the animation to be horizontal or vertical only.

System Requirements

  • Mac OSX 10.5 and later: VST, Audio Unit,  RTAS (Protools 7.0 and later), AAX (32&64 bits, native)
  • Windows XP, Vista and 7 & 8 ; VST,  RTAS (Protools 7.0 and later), AAX (32&64 bits, native)

Minimum System Requirements:

  • 1 Gigabyte of RAM and a 1 GHz processor.
  • Chor'X is a plug-in and is not available in a standalone application.
  • Chor'X 1.5 is a 32 and 64-bit plug-in protected with a serial number

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