Introduction to Dialog Restoration with Izotope RX

Pro tool - iZotope RX 7

Introduction to Dialog Restoration with Izotope RX

One of the most importants steps in the Audio Postproduction is the Dialog. We depend entirely on the sound mixer and their capabilities and resources on set to get the production sound with a good quality. Sometimes, this is not the case, and due to external factors, we end up getting a “poor” location sound.
In the audio post-production world we have to fix a lot of things and solve incidentals or negligences that the production crew had on location for different circumstances. These kind of events are not an excuse for the production mixers to think we are a kind of magicians to fix complicated audio. Sometimes, even if they recorded the audio on set from the onboard camera mic and they think we can fix it…. We must say  IT’S NOT POSSIBLE .
Now we are going to dive right into the topic of Dialog Restoration with one of the most important plugins when we work in Post Production. This Plugin is Izotope RX ( This is one of the best tools that Izotope has been developing through the years and each version they launch to the market is way better than the past one). They have several modules for processing to help us cleaning non-wished ambiences, noises, russells, planes and any kind of audio artifacts that we don’t want to hear.
iZotope RX 7

Voice De – Noise

This initial tool is the one that can be used to begin fixing our noise problems. This module works in 2 different ways. The first one is the Auto mode. In this mode the algorithm detects different artifacts and those are interpreted as unwanted noises. Then it reduces them. Of course the reduction will be applied accordingly to how much “aggressivity” we have given to the plugin.
The second way this tool works in is an Advance Mode. Here, it shows us the possibility to extract the type of “noise” we want to erase. We can pick an audio region or noise print  that has only the unwanted noise and then click Learn. After this, we pick the region we want to clean, click process and the noise will get eliminated.
In this plugin we have a few parameters to be aware of. The Threshold determines from which point (level) we want to begin with the noise reduction. Then, we have the Reduction parameter, which controls the aggressivity of reduction once it overpasses the Threshold level.
Denoise Izotope RX 7

Ambience Match

This powerful tool is very simple, but probably the most useful one that we can find on the suite Izotope RX.
This tool will allow us to fill empty spaces with ambiences and level all the Dialog scenes, as well as cleaning unwanted noises.
To use it we can find the option Learn where we can copy part of the audio signal that we want to use. Then we have the option Trim (dB) which allows us to bump up or down the channel gain and adds this to the dialogues.
Ambience Match Izotope RX 7

Mouth De Click

Last but not least this tool is one of these small details in a details chain that can bring your audio post production to another level. Clicks can be sometimes inappreciable, especially the very first time we hear a sound. But when we notice those small clicks coming out of the mouth as someone is speaking, this tool becomes magic. This is why it is so important to have a trained ear when we work in audio post.
This plugin is really simple to use with these 3 options.
Sensitivity : It’s the module’s aggressivity to eliminate the clicks that are found
Frequency Skew : it moves between -10/0/+10 that represents Low Frequencies / Mid frequencies / High Frequencies giving us the option to pick where we want to eliminate the unwanted clicks.


Click Widening (ms) : This give us the option to choose how fast is going to eliminate one click from another, so we can notices that 0.0 are going to eliminate all the clicks or we can give a little breath between them.
Mouth De Click Izotope RX 7
This was a small introduction on Dialog Restoration with the tool Izotope RX.  There are so many tools in the market, but without any doubt this is the most used plugin in our workflow in Audio 4 Media.
We are going to start researching deeper and sharing so many more tips for Dialog Restoration within this Blog as well as many more topics about audio postproduction. Please follow us on Instagram and Facebook as we are going to upload content every week.
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