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Nugen Audio ISL

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Nugen Audio ISL


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Nugen Audio ISL

Precision True Peak limiter

Nugen Audio ISL is a transparent look-ahead limiter specifically engineered to effortlessly handle True Peak compliance, freeing you up to focus on unleashing your creativity in audio production.

ISL uses the standardized True Peak algorithms of ITU-R B.S. 1770 and related standards (including Apple ‘afclip’ True Peak detection), and is suitable for the control of audio for post-production, music mastering, and broadcast applications. True Peak limiting can also be used to ensure that downstream codecs (mp3, AAC, etc.) do not introduce distortion into the signal.

Note: There are 2 versions of ISL (Surround and Stereo)

  • ISL is a transparent True Peak surround limiter with precise look-ahead intelligence, allowing you to focus on creative audio production while it takes care of compliance for you.
  • ISLst is a transparent True Peak stereo limiter with precise look-ahead intelligence, allowing you to focus on creative audio production while it takes care of compliance for you.

Pristine quality with Nugen Audio ISL

No need to second guess your sample-peak limiter time and again, or deliberately increase headroom to avoid a downstream problem. Just dial in your True Peak limit and let ISL take care of the rest.

  • Broadcast compliant
  • Protect AAC, MP3, etc.
  • Master for online delivery
  • Surround capable
  • ITU-R B.S. 1770-4
  • Apple Afclip
  • Auto release
  • TPmax limit

Powerful processing

Unlike traditional limiters, ISL provides a TPlim control, automatically adjusting transfer curve parameters for minimally invasive brick-wall protection.

Auto-release monitors incoming audio for low-frequency content, dynamically adapting to prevent distortions and deliver transparent audio in the most demanding of situations.

Innovative visualizations

With unique steering and ducking meters, ISL guides you to the perfect settings. Whether you are preserving directional integrity or atmospheric ambiance, ISL gives you the information and control you need to achieve your objective with ease. New processing enhancements assess the incoming audio for frequency content and automatically take care of those minor adjustments required when LF content drives the limiter, delivering increased transparency whilst maintaining our renowned reputation of intuitive operation.

For music production

Let ISL take care of your mastering for today’s music delivery services (Apple Music, Spotify, Tidal, etc.) The risk of distortion from downstream codec conversion (mp3, AAC, etc.) is eliminated with ISL on the master bus.

Mix and master with confidence that your audio will be delivered the way you intend, without downstream distortions introduced by inter-sample clip reconstruction errors.

For post and broadcast

World-class, broadcast quality limiting is an essential requirement for any broadcast production, and the latest standards also demand True Peak compliance. ISL delivers both, giving you superb sound with complete confidence when meeting True Peak delivery criteria.

With ITU-R B.S. 1170-4 compliance and a dedicated brick-wall TPlim setting, you can produce with confidence, leaving ISL to transparently take care of the compliance.

Netflix production technology alliance with Nugen Audio ISL

Loudness Toolkit has been included in the audio tool category of Netflix’s Production Technology Alliance. This is a program for manufacturers that handles sound, image, or metadata during the processes of production to postproduction. If the product meets specific criteria, it is considered as a candidate for the alliance. In fact, any product that bears the alliance logo has been assessed to ensure that it meets Netflix’s technical and workflow requirements.

Nugen Audio is Transparent and Reliable

In use on a daily basis in thousands of studios across the world, ISL is a proven reliable standard for transparent True Peak limiting.

Now in version 2, ISL delivers reliable brick wall limiting and in-depth control to handle the most demanding of situations.

Available in several editions there is an ISL to suit every production requirement.

  • ISL 2st – Mono and Stereo audio production
  • ISL 2 – Surround compatibility up to 7.1.2 for Post & Movie production
  • and ISL 2st DSP & ISL 2 DSP – Avid HDX hardware compatible editions

Typical applications

  • Mix and master for music streaming services
  • Produce broadcast-compliant audio
  • Transparent end-of-chain limiting
  • Apple ‘afclip’ inter-sample monitoring
  • Protection for downstream data compression
  • Preserving quality for podcast material
  • Inter-sample clip management in hi-res files
  • Loudness compliance
  • Audio for video production

Available formats

  • We support AAX, VST3, AU, and AudioSuite in 64-bit.

NUGEN Audio is in the process of phasing out some older plug-in formats. Our most recently updated products no longer support 32-bit or RTAS/VST2. Customers who still wish to use these formats can download a legacy installer from the Build Archive.

Minimum system requirements

  • Mac OSX 10.9 / 512 MB RAM – native Apple Silicon support
    Windows 7 / 512 MB RAM


ISL v2.10.0.3

March 2023

These maintenance releases include native Apple Silicon support.


  • Native Apple Silicon support.
  • New ‘Provide Feedback’ link in plugins.
  • Added link to license help in installers.
how to install nugen audio plugins tutorial

How to Install your NUGEN Audio Plug-in

How to Install your NUGEN Audio Plug-in is a simple, quick and easy guide for installing a new plug-in!  This is the first in a series of videos addressing some of NUGEN Audio's most common Frequently Asked Questions. 

loudness toolkit tutorial

NUGEN Audio: Introduction to Loudness Toolkit #gettingstarted

Watch this short tutorial to get a great introduction to the NUGEN Audio Loudness Toolkit, a comprehensive software bundle for loudness management, consisting of VisLM, LM-Correct and ISL.


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