VSL Synchron Duality Strings (Virtuoso)

Ensemble Strings Virtual Instrument

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    For detailed instructions on the registration/download process, you can visit our dedicated page by clicking here: Install Instructions.

Education Proof

Products with education pricing are for students & teachers only. To prove your education status we require that you upload proof in the form of an image/PDF.

Types of proof


Student ID Card, Letter of enrollment, or similar


Teacher ID Card, Lecturer ID Card, Payslip, Letter from the school/college

Education proof is submitted to the manufacturer and is accepted at their discretion.

The Basics

iLok is a copy protection method used by many of our brands.

It has 3 types of activations, iLok USB, iLok Machine, and iLok Cloud.

Different brands/products will offer different iLok methods. iLok USB is always an option, but the availability of iLok Cloud and iLok Machine methods is at the discretion of the software developer.

iLok Account

For all iLok protected products, you will need an iLok account. You can create one for free here: ilok.com/#!registration

iLok License Manager

To manage your iLok licenses, there is a dedicated app called iLok License Manager. This app is used to register, activate, and move your licenses between locations.

You can download the latest installers from the iLok website: ilok.com/#!home

iLok USB Key

iLok USB

This activation is stored on an iLok 2 or 3 USB key.

It is the best option for portability, if you frequently move between multiple machines, and offline use.

iLok Machine ID

Machine ID

This activation is stored locally on your computer.

While this is a convenient way to work offline, and does not require the additional cost of an iLok USB, there is the risk of a license being lost in the case of a drive failure.

This option also requires extra care when you upgrade to a new computer, the license(s) must be deactivated on your old machine first to ensure you do not lose them.

iLok Cloud

iLok Cloud

This activation is based online, and requires a "cloud session" using the iLok License Manager.

It requires an active internet connection for the entire time you use the plugin(s).

Strings Masterclass

  • Virtuosic articulations, phrases and loops
  • Runs, arpeggios, glissandos, rises & falls
  • Martelé, ricochet, saltando
  • Articulation integration with Synchron Duality Strings (regular)
  • Two acoustically isolated string ensembles performing simultaneously at Synchron Stage Vienna
  • Seamlessly blend the large broad ensemble with the closer-miked small ensemble

This Collection is an exciting addition to the Duality series, expanding the articulations of Duality Strings (regular) with a host of captivating and oftentimes quite unique articulations.

From special short notes to glissandos and bends, to a great variety of runs and arpeggios that were quite demanding for Vienna's first-class musicians, the fourth installment in the series promises to inspire and entertain.

The recordings follow the same Duality principle of two separate ensembles performing on Stage A and Stage B simultaneously, giving you a variety of options to create your own blend or rely on perfectly pre-configured Mixer Presets.

Users of Synchron Duality Strings (regular) will find the playing techniques of the virtuoso collection seamlessly integrated into their existing range of available articulations.

As an example, the category of short notes of the Merged Preset will now display 10 different options, from the spiccato, staccato and détaché variations to martelé, ricochet and saltando.

The recordings for this collection required an extremely high level of skill from the musicians involved, who needed decades of experience to achieve this kind of controlled, yet emotional virtuosity.

Playing arpeggio loops in the upper hand positions is not only extremely challenging, but also quite unusual.

Each individual player has contributed a great deal of energy and expertise that comes alive in this unique virtual instrument.


Détaché with a sharp attack achieved by placing the full weight of the bow on the strings even before the bow stroke, and dampening the string by keeping the bow on the string after the stroke


Throwing the bow on the string so that it bounces and produces a series of rapid notes.


Playing rapidly in the middle of the bow so that the bow bounces very slightly off the string after every note.

Crescendos and Diminuendos

Short, medium, and long.


The sliding of the finger on the string - normal/tremolo/saltando, very fast/very slow, up/down.

Chromatic Runs

Played legato and détaché a 5th/3rd/2nd up and down, also available as loops.

Rises and Falls

Up and down slides at the end of short/détaché/sustained/cresc./dim. notes.


Major, minor, major 7th, minor 7th, augmented and 5th chords in various tempos, also available as loops.

Pizzicato arpeggios

Section Sizes

Stage A

  • 14 1st Violins
  • 12 2nd Violins
  • 10 Violas
  • 10 Violoncellos

Stage B

  • 8 1st Violins
  • 6 2nd Violins
  • 5 Violas
  • 5 Violoncellos

Standard Library Microphone Positions

Stage A

  • Solo Mic (Mono)
  • Mid Mic (L/R)
  • Main/Room Mic - Decca Tree Stereo (L/R)
  • Main/Room Mic - Decca Tree Mono (Center)

Stage B

  • Dark Mics (L/R)

Full Library Microphone Positions

Stage A

  • Solo Mic (Mono)
  • Mid Mic (L/R)
  • Ribbon Mic (L/R)
  • Main/Room Mic - Decca Tree Stereo (L/R)
  • Main/Room Mic - Decca Tree Mono (Center)
  • Main Surround - Stereo (L/R)
  • High Stereo (3D) - Stereo (L/R)
  • High Surround (3D) - Stereo (L/R)

Stage B

  • Dark Mics (L/R)
  • Bright Mics (L/R)

Standard Library

  • Sample Amount: 76,614
  • Download File Size: 16.4 GB
  • Installed File Size: 34.9 GB

Full Library

  • Sample Amount: 140,459
  • Download File Size: 32.0 GB
  • Installed File Size: 69.9 GB

System Requirements

  • MacOS 10.14 Mojave and above
  • Windows 10 and above (64-bit only)
  • Intel, AMD, or Apple Silicon CPU
  • 16GB RAM or more
  • 34.9GB free storage space for the Standard Library
  • 69.9GB free storage space for the Full Library
  • Free iLok account and iLok License Manager
  • iLok Cloud and iLok USB licensing methods are supported

Plugin Formats

AAX Native, AU, VST2, VST3, and Standalone

Crossgrade Proof

This crossgrade is for owners of a competing DAW. To prove your DAW ownership, we require that you upload proof in the form of an image/PDF.

Types of proof

A copy of your purchase receipt for the original license or the most recent update/upgrade

A screenshot of your product registration

A photo of your package (either CD/DVD or printed manual), with the unique serial number included in the photo.