Izotope Rx Plug Ins
Tutorial on Commonly Used Modules
This is our 3rd article on iZotope’s audio repair tool RX 7.
We will continue to look at editing using different modules.
Though many modules are included, I have chosen a few which I find personally useful and common to take a look at.
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iZotope RX 7 Tutorial ③ – Video Access
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De-hum
First take a listen to this sample.
https://sleepfreaks-dtm.com/wordpress/wp-content/uploads/2020/03/Hum_Crackle_pre.mp3
We can hear a low humming noise as well as a constant crackling sound as well.
Lets try to get rid of these.
We will be using De-hum to remove the hum noise.
Hum noise is usually based around low frequencies in the 50-60Hz range, and is a noise that contains a number of harmonics.
We could select 50 or 60Hz from Base Frequency, but if you want AI to make the choice for you, click the Suggest button at the top.
This will analyse the sample and Free mode will allow it to set a more accurate frequency.
The hum noise can been reduced greatly but if the voice has been negatively effected as well, we can lower the number of harmonics down right on the brink of effecting the main sound. We can do this from the Number of harmonics fader.
Next lets adjust the amount of cut. You can make changes from the screen, but the frequency points can get shifted in free mode so we’ll enter numerical changes below.
Find a point where the noise isn’t noticeable yet the vocal remains clean.
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For the low end, you can cut up until the point where it starts effecting the vocal. We will turn the High-Pass Filter on and cut under 100Hz.
Though you most likely won’t be using the Low-pass-filter, it may be necessary depending on the type of noise present.
If we want to make more detailed edits on the harmonics we can choose a different Linking Type.
For the default ALL setting, moving the slider here will have a slope effect on all frequencies.
By selecting Odd/even you can control the odd and even harmonics separately.
The Slope slider will help lower the reduction effect on higher frequencies.
When None is selected the link is removed, allowing you to control the Gain of individual harmonics.
De-Crackle
Next lets look at getting rid of the crackling pop-like noises.
We will be using De-crackle.
Izotope Rx Vst
- Quality：Low will work faster, while High will provide a better sound quality. Medium may yield better results than High depending on the situation, so its best to listen and compare this settings.
- Strength：Determines the strength of the effect, and a higher setting will get rid of more noise but can negatively effect the vocal sounds. Use “Output crackle only” to hear just the crackle sounds and find the right setting.
- Amplitude skew：Allows you to determine the amount of noise editing by the volume of the input signal. Turning it to the right focuses on the louder areas, while turning it to the left will do the opposite. We can set this higher if dealing with clipping noise, but for small detailed crackling noises such as this, it is best to set this parameter on the lower side.
For noise that couldn’t be completely removed, we can try using Spectral De-noise which we took a look at in our previous article.
https://sleepfreaks-dtm.com/wordpress/wp-content/uploads/2020/04/Hum_Crackle_processed.mp3
As you can hear, we have been able to clean up the audio.
De-reverb
Now lets change the sample audio and take a look at the unique De-reverb.
As the name implies, this helps remove reverb and room reflections in a recording.
First lets hear the sample for this example.
https://sleepfreaks-dtm.com/wordpress/wp-content/uploads/2020/04/Reverb_pre.mp3
We can clearly hear the reverb in this sample.
We will be using De-reverb on this audio.
Though all of these parameters may seem confusing, we can utilise RX 7’s special feature here and get some automatic settings using the Learn button.
To dive a little deeper into the editing, we can leave the Reverb Profile frequency settings set by Learn as is, and adjust the Reduction and Tail length to yield big results.
- Reduction： Increases the amount of reduction of reverb. We want to raise this higher but it will cut out vocal frequencies if set too high, so its best to adjust it to find the right balance.
- Tail length：The further right its pulled the more it works on longer reverb tails. If you get unnatural changes in the vocal sound, be sure to pull this back a little to the left.
- Artifact smoothing：Adjusts the frequency detail of noise removal. Setting it low results in some artefacts in sound, but will increase the amount of reverb reduction. If set higher, you will have less artefacts and a smoother sound, but more reverb will be left over. Its best to listen and find a balance in the middle.
- Enhance dry signal：Increases the volume of non-reverb sounds and expands the dynamic range. This works great on dialogue and human vocals.
The resulting audio after adjusting each parameter is as follows:
https://sleepfreaks-dtm.com/wordpress/wp-content/uploads/2020/04/Reverb_processed-1.mp3
Though its not a completely dry signal, a considerable amount of reverb has been edited out.
De-clip
Next, if we happen to accidentally distort audio during recording we can use De-clip to remove clipping noise.
We have a sample prepared for this as well.
* Be aware that this sample is louder than the previous examples.
https://sleepfreaks-dtm.com/wordpress/wp-content/uploads/2020/04/Clip_pre.mp3
In de-clip we will first setup the threshold of clip sounds. We will use this histogram as a reference but it looks like nothing is displayed at the moment. The histogram will be updated depending on the selected area, so lets first select the portion with vocal audio contained.
Izotope Rx 5
If you still don’t see anything, zoom out in the Histogram. Because the majority of sound is clipping, we can see quite alot reflected in the higher volume areas.
By pressing the Suggest button, it will automatically set the Threshold to the suggested point.
Its clipping to the point that that nothing is visible in the center, so it’s set to 0dB. If the audio isn’t this distorted, we would set the threshold a little below the clip.
The remaining parameters work as follows:
- Quality：If your CPU can handle it we suggest using High. If your computer can’t handle the strain when using this as a plugin, use Medium or Low.
- Makeup gain：Most distorted recordings are too loud to begin with, so we will be lowering this. You could adjust this parameter so that the fixed audio matches the volume of your other takes as well.
- Post limiter：Applies a peak limiter at the end to prevent the edited audio from going over 0dBFS. Its best to tick this box.
Lets hear how the sample sounds after making adjustments.
https://sleepfreaks-dtm.com/wordpress/wp-content/uploads/2020/04/Clip_processed.mp3
The sound is much cleaner and its hard to believe it was distorted.
This completes our look at some commonly used modules in RX 7.
RX 7 covers a vast field of noise/reverb related issues, so be sure to try it out for your own recordings!
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- CATEGORY:
- Mixing plugins
Presets
From the Preset Manager, you can select from default presets and presets you have saved.
To browse presets, press the Presets button and click the name of any preset. If you like what you hear, press the Presets button again to hide the window.
- ADD: Clicking this button adds the current settings as a new preset. You can type a name and optionally add comments for the preset.
Note
- Note that a few keys such as * or / cannot be used as preset names. If you try to type these characters in the name they will be ignored.
- This is because presets are stored as .XML files for easy backup and transferring. Their filenames are the same as the names you give the presets (for easy reference) and therefore characters that are not allowed in Windows file names are not allowed in preset names.
- Note that a few keys such as * or / cannot be used as preset names. If you try to type these characters in the name they will be ignored.
- REMOVE: To permanently delete a preset, select the preset from the list and click the Remove button.
- UPDATE: When you click the Update button, your current settings before you opened the preset window are assigned to the selected preset (highlighted). This is useful for selecting a preset, tweaking it, and saving your changes to the existing preset.
- IMPORT: Imports a preset into the preset folder.
- FOLDER: Opens a dialog that shows your current preset folder. You can also select a new preset folder from this dialog.
- RENAMING PRESETS: You can double click on the name of a preset to enter the edit mode and then type a new name for that preset.
- CANCEL: Press Escape to close the preset system dialog and revert to the settings when you opened the preset manager.
History
Pressing the History button opens the History window. This view gives you a list of all of the actions you’ve performed inside the plug-in, allowing you to step back to previous settings and undo changes.
- CLEAR: Resets the History list.
I/O Meters
- Select plug-ins feature an input and output gain control and input and output metering.
- In stereo instances of the plug-ins, the gain controls are linked stereo gains.
Options
- General Options
- Tools for managing your authorization and troubleshooting DAW/plug-in issues live here.
- Tools for managing your authorization and troubleshooting DAW/plug-in issues live here.
- Authorization & Updates
- This will allow you to perform any of the authorization steps outlined in the Authorization
- This will allow you to perform any of the authorization steps outlined in the Authorization
I/O Options
The RX I/O meter displays a lower bar representing the average level (RMS) and a higher bar representing peak level. There is also a moving line above the bar representing the most recent peak level or peak hold.
- PEAK HOLD TIME: If peak hold is on, you can choose different peak hold times. The choices are 250 ms, 500 ms, 1000 ms, 5000 ms and Infinite. If set to infinite, the peak value will be held until you click on the current peak display.
- INTEGRATION TIME: Specifies the integration time for RMS calculation. In most RMS meters, the integration time is set to around 300 ms, which makes the RMS meter similar in ballistics to VU meters.
- READOUT: Allows you to control what level value is displayed on top of the meters: peak or actual (real time). If set to Max Peak, the display will show the highest peak level. If set to Current, the display will reflect the meter’s current value.
- ENABLE I/O METERS: Turns the level meters on or off.
- SHOW PEAK HOLD: Turns the peak hold display for the level meters on or off.
Latency
Izotope Rx7 Plugin
Some of the processing modes in the RX plug-ins are very CPU intensive and result in a delay of the signal. That is, RX needs some time to process the audio before it can send it back to the host application. That time represents a delay when listening or mixing down.
Izotope Rx Plug Install
Most modern DAWs and NLEs provide delay compensation—a means for RX plug-ins to tell the application it has delayed the signal, and the host application should “undo” the delay on the track (usually by adding compensating delays to other tracks in real-time processing, or by adjusting the rendered file after processing in offline processing).
When Enable Delay Compensation is enabled in the Latency menu, we will report our latency to the host application.
Plug-ins Air Freshener
If your application doesn’t support it, or skips/stutters with this option on, you can always manually correct the delay offset in the host application (manually edit out the short delay of silence). To help you perform manual correction, the delay RX introduces is shown below as Total System Delay in both samples and milliseconds.
Disabling delay compensation can help prevent this delay when processing offline in some older applications.
Freezing our reported latency value may help with delay compensation problems during real-time processing in some older applications.
- View Buffers: Shows buffer information from the host’s track. This is useful for diagnosing problems like audio dropouts or rare problems caused by inconsistent buffer sizes.
- Host Sync: Shows information reported from the host program about playback location, loop and transport state, tempo, etc. (when applicable). This is useful for diagnosing some rare timeline-related problems in specific DAWs.
- Enable Multicore (Spectral De-noise only) This option is available in the Spectral De-noise plug-in. Enabling this option lets RX process Spectral De-noise Quality Modes C and D more efficiently by spreading its processing across multiple computer cores.