The Industry Standard Noise Reducer “RX 7”

• Paint out distortion in the Spectrogram. We often think of De-clip, De-click, and De-crackle as.
• Open an audio file in the RX Audio Editor or send it using RX Connect. Select the distorted portions of the audio and open the De-clip module. Set the Threshold to identify where the De-clip algorithm should begin to apply processing. For this example, a threshold of –8.4 dB worked well.
• 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.
• Each RX module features a preview button that allows you to audition the module's effect on the selected audio or project. By using preview, you don't have to apply the process to the file to hear the result, you can click Preview and adjust parameters as audio is playing back, allowing you to fine tune module settings without having to apply and undo them multiple times.

Highlight the area of audio that requires editing. In the Effects menu, load the iZotope RX Connect plug-in from VST3 - Restoration - iZotope, Inc. (If you do not see the RX Connect plug-in, open the Audio Plug-in Manager and Scan for Plug-ins, then make sure RX Connect is enabled). When the plug-in window opens, click Apply.

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.

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.

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.

You can select algorithms for separation from Separation algorithm.

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.

The RX Audio Editor is designed to give you a range of processing options. Most of the modules in RX feature multiple processing modes, ranging from fast algorithms that sound great on most material to very time-intensive algorithms for critical applications.

Understanding the Presets, Preview and Compare controls will help you save time, especially when taking advantage of RX’s more powerful processing modes.

Presets

Each module in the RX Audio Editor features a preset menu that allows you to choose between factory presets and custom presets that you have saved. Any preset saved in a module in the RX Audio Editor can be opened in the corresponding RX plug-in, when applicable.

• Add Preset: Creates a new preset
  
• Remove Preset: Removes a preset from the drop-down list
  
• Rename Preset: Changes the name of a preset
  
• Set Preset Shortcut: Allows you to define a keyboard shortcut for any preset in order to recall and apply different module settings quickly
  
• Import Preset: Allows you to import presets (from another machine or another user, for example)
  
• Reload Preset: Rescans your preset directory for this module in order to refresh the available preset list
  
• Explore Preset/Reveal Presets in Finder: Opens Windows Explorer or Finder window to the location of your presets on disk
  

Preset directory locations:

• On Windows: C:Documents and SettingsusernameMy DocumentsiZotopeRX 6Presets
  
• On Mac: username/Documents/iZotope/RX 6 Audio Editor/Presets/
  

Module Footer Controls

Preview

Izotope Rx 7 Rx Failed To Apply The Selected Processing System

Most RX modules feature a Preview button in the bottom panel of the module window. Some modules don’t support Preview because of the time-intensive nature of their processing, in many of these cases the Compare settings option is available (explained below).

Preview allows you to make adjustments to controls and hear the results without the need to process and undo processing multiple times to achieve your desired results.

Preview will apply to your active selection or if no selection is made, Preview playback will start from the current playhead position. When Loop is enabled in the Transport, Preview playback will loop.

• PREVIEW [Shift-Space]: Plays a pre-rendered preview of the module’s current settings on the selected audio. During preview, module settings can be adjusted and adjustments will be heard within the length of the current preview buffer. For most modules, the Preview buffer size is about a half of a second long, but the Preview Buffer Length can be adjusted by accessing the Preview Options, explained below.
  

• BYPASS [Shift-B] Bypasses module processing during preview.
  

• Preview Options [+]: Allows adjustment of the Preview Buffer size.
  

For more CPU-intensive settings, like the highest quality algorithms in Spectral De-noise and the highest quality De-click settings, RX can buffer playback to allow you to preview these slower than real-time processes.

Note about Preview buffering

When Previewing module processing, the active buffer length for preview rendering is tinted red in spectrogram/waveform display.

Pre- and Post-Roll
When previewing an effect, it is often very helpful to hear a small portion of the unprocessed audio before hearing your processed selection. This can provide a much clearer comparison and allow you to more easily discern whether or not the current processing settings are producing the desired effect.

By default, RX will play back one second of unprocessed audio before and after the current selection when previewing your processing. The Pre- and Post-roll times can be defined in the Preferences > Misc window. RX can play up to ten seconds of audio before or after the previewed selection. Pre- and Post-Roll will also occur when previewing a looped region of audio

How to disable Pre- or Post-roll

Set the Pre- and Post-roll times in the Preferences > Misc tab to 0

Tip

Pre- and Post-roll can also be simulated manually by holding Control (Windows) or Command (Mac) to set the playhead to any desired position while preserving your audio selection. Once the playhead is set, clicking on Preview in the desired module will then start the Preview playback from the playhead position.

Compare

When you want to quickly try a lot of different settings, use the Compare feature. In some cases, you might not know what settings of a module will give you the best, most transparent results. By hitting the Compare button instead of the Process button, you can audition multiple settings of the same module and then audition the results side by side in the Compare Settings.

While one group of settings is processing in the background, you can return to the module and try a different group of settings. Learning to use the Compare Settings tool can save you from having to apply and undo a process multiple times just to find the right settings, making it a valuable time-saving feature.

Another advantage to using the Compare Settings tool is seeing the effect your settings have in the spectrogram/waveform display and spectrum analyzer.

Izotope Rx 7 Not Working

• Process Comparison List: Each time settings are sent to the Compare window, a new list item is created, by default titled “Settings 1,” “Settings 2,” etc.
  
• Preview: To hear (and see) the result of an item in the list, select that item and hit Preview.
  
• View Settings: Updates the controls to reflect the settings selected in the Process Comparison List
  
• Remove: Remove an item from the list.
  
• Rename: Allows you to rename items with more descriptive names.
  
• Process: Apply the selected list item to the audio file.