• Izotope Rx Dialog Denoiser 1

• Sound Quality
• Ease of use
• Features
• Bang for buck
• Overall:

1. Is Adobe Audition's noise reduction process a basic version of Izotope RX? I have never seen or tested a 'live' Izotope RX (but might be persuaded to buy the basic version), but from what I see in the demo video's and screenshots there are quite a few similarities. Plus, Adobe Audition does contain some stuff licensed from Izotope. Just wondering.
2. In RX3, Dialog Denoiser was an Advanced only feature. In RX4, iZotope have made it available so everyone can use this amazing plug-in. The automatic feature is really good so that you can just leave it on a dialog track and it will clean up everything you throw at it, in real time, with zero latency.
3. In this article Supervising Sound Editor and Re-recording Mixer David Barber from Juniper Post shares how he used iZotope RX 7 Advanced as a key part of the dialogue editing stage in the audio post-production of “The Killing Of Two Lovers”. Recently, David had the pleasure of joining his friend.
4. To edit audio from Adobe Premiere Pro in RX: Right-click on an audio clip in your timeline and select ‘Reveal in Finder’(OS X) or 'Reveal in Explorer' (Windows) Open the resulting file in RX. Perform the required audio edit, and then click File-Overwrite Original File.
5. Dialogue De-noise is a simple, no-latency denoiser ideal for achieving basic high-quality denoising on a variety of material with the minimum amount of time spent tweaking controls. The amount of denoising is determined by the noise threshold curve. A higher threshold generally means more noise reduction.

Unwanted noise is the ultimate menace. This is one thing on which all audio professionals can agree! In music, post production, restoration and archiving, or even forensics, engineers everywhere are battling daily with a never-ending onslaught of buzzing, clicks, pops, hiss, clips, crackles and a heap of other unpleasant sounds that haunt our tracks.
Over the years there have been a number of plugin-based solutions to tackle these problems – some more successful than others. In the past few years, one name comes up over and over again among audio professionals as the “one stop shop” for audio noise reduction and restoration. Of course, I’m talking about iZotope’s flagship RX software suite. And now, with their latest and greatest version – “RX 3 Advanced” – iZotope has added two brand new plugins into the RX fold: Dialogue Denoiser and Deverb.
Let’s jump in, and see what RX 3 Advanced is all about!
TECH SPECS: RX 3 Advanced is a Native-only plugin for MAC and PC and retails for $1,199. Formats are AAX, RTAS, AudioSuite, VST, VST3 and Audio Unit. Compatible with the new 64-bit Pro Tools 11 and 32-bit hosts including Pro Tools 7.4 to 10 as well as Avid Media Composer, Nuendo, Cubase, WaveLab, Logic, EDIUS Pro 6.5, Final Cut Pro, Audition, Premiere, SONAR, ACID, Digital Performer, Sound Forge Pro, Vegas Pro, and many more.
WHAT IT DOES: RX 3 Advanced is a complete suite of audio production plugins for professional audio repair and restoration. RX 3 can be used as individual plugins within your host DAW or as a standalone application (included) for more detailed offline work. Also bundled with RX 3 Advanced is the brilliant iZotope Insight metering suite – of which you can read my in-depth review here.
IN USE:
RX 3 Advanced is comprised of individual plugins (both real time and AudioSuite) within your host DAW allowing users to fix tracks quickly and efficiently. All of these RX 3 modules are also available for use in the standalone RX application along with some unique extras.
Two brand new plugins have been added to the RX 3 Advanced version since its upgrade from version 2 – they are: Dialogue Denoiser and Deverb. Let’s take a look at each of the core units individually, as well as the new additions in the new “Advanced” version:
Denoiser – Denoiser is the plugin in the RX suite that gets the most consistent use on my sessions both in music and post. Denoiser controls the level of stationary noise present in an audio track. Stationary noise generally includes tape hiss, microphone hum, fans, highway traffic, HVAC systems and any similar sounds which tend not to change in level or spectral shape significantly throughout the recording.
To use Denoiser, simply identify a section of your audio track that is just the noise and select “LEARN” in Denoiser. This creates a noise profile that Denoiser uses to filter out the noise from your track. The two basic sliders for Threshold and Reduction allow users the primary controls over the noise reduction. Artifact Control and Quality sliders make up the main face of the Denoiser plugin with an additional set of Advanced noise floor settings available in a separate window.
With Denoiser, I usually work with the AudioSuite plugin to process the denoising directly to my track. iZotope’s RX 3 plugins have excellent finely-tuned default settings, which make for fast work. Simply load in your noise profile, select the whole file you want to denoise, and render. After spending some time with Denoiser, you will start to get a feel for when your tracks may call for slightly more or less on the Reduction fader.
Don’t forget to create a duplicate playlist for your raw tracks before processing! This will allow you to return to your original unprocessed tracks at any time should you decide to reprocess anything.
Declicker & Decrackler – Together, these two plugins tackle clicks, pops, mouth noises, thumps, and similar intermittent noises that are prevalent in modern recordings as well as older source material such as older vinyl and other degraded audio sources. The main difference between Declicker and Decrackler is that Decrackler is designed to handle a more continuous stream of irregularities in your audio whereas Declicker handles more sporadic clicks and pops.
Declicker is one of those magical tools that just works and is an absolute essential for me these days. The Declicker module alone has saved entire projects for me and for many other engineers I know. A good example of that is a live album I recently tracked where the multi-track capture rig was on a separate power current than the house PA. This is never an ideal situation, of course, but unfortunately these were the conditions of this site.
Listening back the night of the show, the tracks all sounded pristine. But, when listening critically at home during editing and mixing, I started noticing a consistent light clicking on the electric guitar tracks, vocals and keys. 60-70 percent of the clicks were borderline inaudible when the whole mix was up but the rest were very audible throughout the album.
I used RX 3’s Declicker module to clean up nearly all of the guitars, vocals and keys on the entire album. While the work was a bit tedious, Declicker alone absolutely saved this project for me. Declicker removed tens of thousands of errant clicks from my tracks without ever adding unwanted degradation or artifacts.
Declipper – Declipper repairs digital and analog clipping from A/D converters pushed too hard or magnetic tape that’s been over saturated.
The basic controls for Declipper are Threshold and Makeup gain. It does take some trial and error to find what will work best for your audio but Declipper does do an excellent job repairing the harsh distorted qualities that often spike in TV and film mixes and stick out unnecessarily. Watch the demo here.
Unlike Denoiser and Declicker, Declipper seemed to introduce some artifacting into the signal as a byproduct of the processing of the clipped signal. Great results can be achieved but of course the source audio will always be the most crucial factor in determining just how effective Declipper or any noise reduction plugin can be.
Hum Removal – RX 3’s Hum Removal tool is designed to target low frequency buzz or hum often caused by electrical grounding issues. Hum Removal includes a series of notch filters that can be set to remove the base frequency hum at 50 or 60hz as well as the resulting harmonics.
The Hum Removal plugin comes with presets for 50 and 60hz as well as a “Free” setting which allows the user to set the notch frequency, which is chased by each of the harmonic notches. Hum Removal does an excellent job repairing electrical hum without disturbing even the most delicate acoustic based instruments.
Spectral Repair – RX 3’s Spectral Repair is a tool that is most often used to repair sudden unwanted noises in a section of audio. Spectral Repair displays audio visually in both waveform and spectrogram mode simultaneously. This gives users both a time-based and frequency-based view of the offending audio in their project allowing for quick and easy repair of sounds that only a few years ago editors would have been forced to cut around or leave in unchanged. A good example of this would be a loud whistling during a concert recording, or a siren that appears in the background during crucial dialogue or an interview. These types of unwanted frequency specific problems are the perfect job for Spectral Repair.
RX 3’s manual lists a number of unwanted sounds that Spectral Repair can attack. Many of these sounds we’ve all dealt with at one time or another but frankly I’d never even considered them possible to fix! (i.e. squeaky chairs, coughs, mic stand bumps, clattering dishes, mobile phones ringing, metronome click tracks, background chitchat, dropouts from broken audio cables, fret and string noise and dog barks.)
To use spectral repair, load in a small section of your track that includes the offending audio. Once loaded, there are different selection tools such as Lasso, Time Selection, Frequency Selection and Brush, which allow users to select (as specifically as possible) the problematic piece of audio. From there, you can use either the Attenuate, Replace, Pattern or Partials + Noise modules to fix the problem depending on how badly damaged the audio file is.
Now that we’ve covered the core plugins in RX 3, let’s take a look at some of the new additions to the RX 3 Advanced package:
Dialogue Denoiser – The beauty of this plugin is its simplicity. Dialogue Denoiser is a stunningly powerful tool for high-quality denoising in real time with minimal controls and zero latency. In the vast majority of cases, Dialogue Denoiser works brilliantly in auto mode right ‘out of the box’. Simple controls for Threshold and Reduction make for extremely quick work.
Most recently, I’ve used Dialogue Denoiser on several short film projects. I’ve settled on creating an intermediary Aux bus specifically for Dialogue Denoiser with the input routed from all my dialogue tracks and the output sending to my dialogue master bus which allows me to control the Reduction and threshold settings of Dialogue Denoiser with Pro Tools automation when necessary for dialing in exactly the right amount of background noise and ambience.
I really can’t overstate just how quick and easy it is to achieve stunning results with Dialogue Denoiser. It is easily the quickest ‘set it and forget it’ Denoising plugin I’ve ever used.
Of course, users also have the ability to select “manual mode” and create a noise profile dedicated to the track that’s being worked on for more precise control of Dialogue Denoiser. Thus far for my projects, I’ve found the auto mode to be completely usable on its own without providing any sort of learned noise profile.
Deverb – Deverb is one of those “how do they do that?” plugins. Deverb allows users control over the ambient space captured in a recording. As with Dialogue Denoiser, Deverb works in real time either in automatic or manual mode to reduce unwanted room decay and reverb in dialogue and spoken word. Unlike Dialogue Denoiser, Deverb does introduce about 9,700 samples of latency which is more than enough for any DAW with delay compensation to handle.
Basic controls include: Reduction fader, four faders for Low, Low-mid, High-mid, and High on the Reverb Profile, which controls the amount of Deverb effect applied per-band; Tail Length which controls the decay of Deverb processing; and Artifact Smoothing which controls the frequency accuracy of Deverb processing.
Deverb does a commendable job tightening up roomy audio which can help achieve a sharper mix for post-production projects. Deverb will, of course, achieve better results when it has better source material to work with. Dialogue that is already very upfront and present will yield extraordinary results from Deverb while very roomy/distant voice and dialogue recordings can also be helped but will also have quite a bit of artifacting.
These two powerful new plugins add tremendous value to the Advanced version of RX 3. Dialogue Denoiser in particular is really a must-use plugin for me on all dialogue heavy post-production jobs.
RX 3 Standalone Application
In addition to the DAW accessible plugins, RX 3 Advanced comes with its own standalone application for tackling problematic audio issues offline. The standalone application gives users access to the full palate of RX 3 Advanced tools for cleaning up audio. All of the above-mentioned modules are available inside the RX 3 standalone application.
Deconstruct – Deconstruct is an additional tool available only in the RX 3 standalone application. Deconstruct allows users surgical control over the level of noise and tones in an audio track independent of each other. An example of where to use Deconstruct would be to reduce breath noise in wind instrument recordings such as flute or saxophone.
The controls for Deconstruct are simply faders for Tonal Gain and Noisy Gain. The results of Deconstruct are so unique, you’re really taken by surprise the first time you hear its results.
Several engineers I’ve showed this feature to expressed total disbelief at Deconstruct’s ability to remove not the noise but the pure tone leaving behind just the noise. Of course, Deconstruct can work both ways to subtlety reduce air and noise qualities. This particular demo (above), however, highlights the creative possibilities of Deconstruct.
Additional New Features
This review would feel incomplete if I didn’t include at least a quick rundown of some of the additional new features available in the RX 3 Advanced bundle:
iZotope Insight – This comprehensive metering tool, which is a must-have for compliance with broadcast standards, comes bundled with RX 3 Advanced.
Multicore Processing – RX 3 has been optimized to use every available core in your machine to make quick work of intense audio processing jobs.
Multi-file workflow – RX 3 can open, edit and process multiple files at once for a true multi-task workflow.
Advanced Declick Parameters – Additional targeting of Click, Thump and Discontinuity can be done individually in Declick, with click widening and Frequency skew modes.
Redesigned User Interface – The overall graphical design of RX 3 has been given a facelift since RX 2 and it looks gorgeous.
TO BE CRITICAL: While I’m sure there’s always room for improvement, RX 3 Advanced leaves me with very little to criticize. I do find myself wishing there was a way for iZotope and DAWs like Pro Tools to work together to create a feature that would allow for integration between the DAW and the RX 3 offline application. It would be incredibly helpful to have the ability to select a clip in the Pro Tools timeline and have an “open in RX 3” feature which would allow users to work in the standalone RX 3 application and then process the audio clip directly back into the Pro Tools timeline.
As of now, I don’t use the standalone app very often simply because the process of exporting an audio file, opening it in RX 3, cleaning the audio, processing, re-exporting and then re-importing back into Pro Tools simply isn’t an efficient use of time unless it’s absolutely necessary to the project.
IN CONCLUSION: RX 3 Advanced is fighting the war on noise from every imaginable front possible. The tools available in the RX 3 Advanced package are quite simply the best collection of noise reduction and restoration modules available. With the addition of Dialogue Denoiser and Deverb, the price point for RX 3 Advanced is unbeatable anywhere else. RX 3 Advanced belongs in every studio and engineers toolkit. There is simply no excuse for noisy audio anymore!

Izotope Rx Dialog Denoiser 1

Jul 07, 2014  A few weeks ago, we shared a post about using Adobe Audition's built-in noise reduction tools to rescue bad production audio.While I personally have been satisfied by the results that I get from the suite of tools in Audition, many of the comments on our Facebook post and the article itself mentioned a popular noise-reduction plugin called Izotope RX3.

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