iZotope RX Loudness Control

 

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As more emphasis is being placed on loudness compliance around the world, it’s important for editors and sound mixers to have the right tools to stay legal. iZotope offers its Insight metering to see where your levels are, but a new addition is the RX Loudness Control plug-in. This not only analyzes your mix, but fixes it to be compliant. This plug-in is designed for Avid ProTools and Media Composer, along with the Adobe Creative Cloud applications. It works with mono, stereo, or surround mixes, but is not a real-time plug-in. Instead, it quickly analyzes your final mix and performs a faster-than-real-time processing of the track.

RX Loudness Control includes presets for eight international loudness standards and correction includes three components: fixed gain to hit a specific target, optional short-term loudness compression, and True Peak limiting. By design, the intent is to leave the mix dynamics in place, but where necessary IRC II (Intelligent Release Control) limiting is used. This style of limiting is also found in iZotope’s Ozone 6 mastering suite.

Operation for editors using Avid Media Composer or Adobe Premiere Pro CC couldn’t be easier. In Media Composer, first create a mixdown clip of your timeline mix and place that on an available track. Mute all other tracks. Apply the RX Loudness Control as an AudioSuite filter to the mixdown clip. Set the loudness standard preset, analyze, and render.

With the Adobe applications, the RX Loudness Control appears as an export preset in the export module of Premiere Pro or through Adobe Media Encoder. Simply export your timeline using the RX Loudness preset. Make adjustments to the settings as needed. If you want the mixed/processed track to automatically be imported back into the same project, make sure to check that box. Now export. The new .wav file will appear in your project, so simply mute all existing audio in your sequence and drop the processed .wav onto an empty audio track.

In the current version, there is no native support for Apple Final Cut Pro X or Logic Pro X. However, if you also own, subscribe to, or have access to Avid or Adobe applications (with the RX Loudness Control plug-in installed), you could use one of those to process your FCP X mix. First export a mix from FCP X as either a self-contained QuickTime movie or an audio file. Bring that into one of the other applications to encode the file using RX Loudness Control. When that’s completed, import the processed audio track back into FCP X. Mute or detach and remove all audio from your project (edited timeline) and connect the newly processed composite mix for your final compliant audio mix.

Originally written for Digital Video magazine / CreativePlanetNetworks.

©2015 Oliver Peters