Spectral Repair is a module available in iZotope RX 7 Standard and RX 7 Advanced audio restoration software that lets you remove and replace unwanted sounds and frequencies in audio.
Available for download, iZotope's RX Post Production Suite 4 combines Neutron 3 Advanced, RX 7 Advanced, Insight 2, Dialogue Match, and other tools to help facilitate the post production process. RX 7 Advanced gives you a spectral editor for zeroing in on troublesome audio and includes a plethora of modules that can help you mitigate sonic issues anywhere in the. Composite View lets you quickly and easily apply processing to a number of audio files at the same time. Similar to Batch Processing but using a different workf. IZotope RX 7 301: RX 7 - The Unofficial Video Manual. Take the course quiz. Reset View History. Select 'Allow All Auto-Play' under Auto-Play.
With iZotope RX 8, RX ups the ante with a bevy of new features. Guitar De-noise tightens up noisy guitars. Loudness Control finalizes your audio for broadcast. An overhauled Batch Processor makes bulk processing easier than ever, while an upgraded Music Rebalance module enables you to export stems from a stereo mix. Batch Processing in RX lets you automate processing on groups of files, or apply processing from multiple modules to files, and potentially save hours of work. Batch Processor receives a major upgrade to make it easier than ever to process groups of files, or apply processing from multiple modules simultaneously. Save presets, import module chains, and process several.
Two things make Spectral Repair much more precise at removing problem sounds than simple EQ’ing or filtering: 1. visualization of the audio and 2. algorithm-based audio repair. iZotope’s detailed visualization of the audio shows you a lot more than the waveform commonly displayed in your DAW. With this visualization, you can see different aspects of the audio, and then use one of the selection tools to trace around the problem areas. This is where the algorithm-based repair comes in.
Spectral Repair analyzes the audio surrounding the part you selected and uses that information to fill in the gaps that are left after the unwanted audio is deleted. If that is a bit confusing, it’ll make more sense once we get into the different processing modes.
Modes
Attenuate: Reduces magnitude of selection compared to audio outside of selection. Good for bringing down level of unwanted sounds like door slams or chair squeaks.
Replace: Completely replaces selection with audio outside selection. Good for unwanted sounds that completely obscure the other, wanted audio.
Pattern: Finds the most similar portion of audio outside selection and uses that info to replace the selected problem audio. Use if your source audio is badly damaged and/or has repeated parts.
Partials and Noise: A more advanced version of Replace mode. Uses harmonic synthesis to replace audio. Can correct pitch modulation such as vibrato.
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By accurately selecting the parts you don’t want in your recording and trying out the different modes, some pretty impressive audio repair is possible. I tried two different applications.
The first test was to remove a problem frequency from a snare track, without the phase issues and over-processed sound that sometimes happen with extreme EQ settings. This snare recording had a bit of muddiness in the low-mid range, so I selected the muddy frequency using the Brush tool in the RX 7 Audio Editor:
After I selected that frequency, I opened the Spectral Repair module and tried the different algorithm modes to see what worked best. I ended up going with the Attenuate mode. I turned the Strength setting all the way up to 4 to exaggerate the effect of the processing, but in a real-life situation I’d probably use 1 or 2, so the snare doesn’t get too thin-sounding. As you can see in the screenshot below, the Compare Settings window lets you preview the audio both before and after processing, and then (if you like the result) you can hit Render in the main Spectral Repair window to apply the processing.
After applying the processing, you can see the attenuated frequency on the first snare hit, as compared to the later hits:
Here’s the audio of the snare track before processing:
And after:
For a more dramatic example of removing a problem sound, I tried something different. I took a recorded track of live drums and added an obnoxious sampled saxophone note to see if Spectral Repair could deal with it. In the screenshot below you can see the saxophone note as a series of horizontal lines (probably representing the different harmonics of the note):
For this one, the Attenuate and Replace modes seemed to be leaving a gap in the audio where the selection was, without much of the original drum recording left. But the Pattern mode did an amazing job of deleting the saxophone note while leaving the drums completely audible. I had to adjust the “surrounding region length [%]” control a bit before the algorithm got the rhythm right.
However, once I did that, the results were pretty impressive:
Here’s the original drum track:
Here’s the drum track with added saxophone note:
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And here’s the track after processing with RX 7 Spectral Repair:
The Industry Standard Noise Reducer “RX 7”
We will be taking a look at iZotope’s audio repair tool “RX 7” over the course of a few articles.
RX 7 helps get rid of unwanted noise in a recording, fixes distorted/clipping audio, and more at a level which would otherwise seem impossible without using this tool.
It is an incredibly high quality tool and is considered to be an industry standard.
Of course, recording a clean signal in a noise-free location would be ideal for most situations, but sometimes noise ends up making it on the recording and in many cases, you may not be able to rerecord.
You can bring your valuable recordings back to life using RX 7.
In addition, ver 7 comes with the new Music Rebalance feature. You can break a mixed L/R track into parts and balance volume, mute, or even hear them in solo using this revolutionary feature.
We will look at this in detail later, as it is a unique function found in the RX 7.
iZotope RX 7 Tutorial ① – Video Access
Opening Files
In this tutorial we will be using the standalone “audio editor” version of RX7.
When you open it, you’ll first see this file window.
You can choose to drag and drop a file or open a file.
We’ve opened the file as shown.
As you can see, we have purposefully chosen a sample that has clipping (digital distortion) in it for this example.
We will be using RX 7 to fix this issue.
Using Repair Assistant
RX 7 comes with various modules displayed on the list to the right, but you may not know whats what on this list if its your first time seeing it.
But no worries, by using the Repair Assistant feature, AI will automatically detect the issues in the audio clip and select/apply various tools to it.
A pop up window will appear after clicking Repair Assistant, so select the appropriate audio type.
Dialogue refers to narration and conversation recordings, while Music refers to instrument, vocal, and other musical recording, and everything else falls into the Other category.
Press the Start Analysis button to begin analysis.
When analysis is complete, you can compare the original to 3 repaired version options.
The strength of the repair effects can be adjusted in this preview mode as well. Lets try clicking on the fader mark below.
A strength preview will be created, and a slider will pop up allowing you to adjust the strength. Move this fader to adjust the strength of the repair effects.
We could go ahead in Render the audio here, but why don’t we look and see what kind of processing is being done here first.
By putting the cursor over A, B, or C, you can look at the module names included in its module chain.
To see in further detail, click the Open as Module Chain button below.
A pop up window will appear where you can see the details of the module chain.
By clicking on the fader marks, you can view/change the settings within an effect module.
Now that we took a look at the settings, lets render this audio.
Click on the Render button to begin rendering the audio.
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Once the rending is complete, the effects will be visible on the new waveform, and repair history will be added below to History.
Each module setting is also recorded in History, allowing you to change the audio to any previous version in History.
Last, Save As to complete the audio editing process.
Though in this example we looked at using the Repair Assistant to get a basic fix of our audio, the potential of RX 7 goes above and beyond this. We will be looking at other modules in our following articles which allow you to edit sounds that RX 7 may not be able to intially pick up.
About Music Rebalance
Last but not least, we will take a look at Music Rebalance for this article.
Music Rebalance breaks a mix track into Vocal, Bass, Percussion, and Other and allows you to adjust each part.
Prepare a mix file with these instrument parts in it to utilize Music Rebalance.
Select Music Rebalance from the module list on the right.
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A pop up window will appear, and we can make adjustments while playing using the preview button.
- ①Gain：Adjusts the volume of an individual part
- ②Sensitivity：Raising it raises the clarity of analyzed signal from the source, but introduces sounds from other instrument parts. Lowering it creates more separation, but leads to more unnatural editing noise. The key is to find a balance of numerical amounts between other parts to get the best effect.
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You can select algorithms for separation from Separation algorithm.
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Under Separation algorithm, Channel independent allows you to run the fastest analysis of parts, but the separation quality will be lower. By going to Joint channel, Advanced joint channel, and so forth, the analysis quality increases but will run heavier on your computer.
Using advanced joint channel would be best when Rendering, but you may want to make adjustments when Previewing depending on your computer specs.
Click the Render button to complete setup and begin rendering.
This completes our first look at iZotope RX7 starting with a tutorial on Repair Assistant and Music Rebalance.
In our next video, we will be taking a look at some of the individual modules.
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