IZotope RX Post Production Suite for Mac is the flagship of the RX line and features four of iZotope’s most powerful tools for audio post production—RX 7 Advanced, Insight 2, Neutron 2 Advanced, and RX Loudness Control.This comprehensive audio post production suite features intelligent and powerful macOS software solutions for everything from dialogue editing to mixing and delivery, plus. Sep 24, 2018 Learn how to use RX 7 for music to solve common audio issues. Isolate a vocal for a remix with Music Rebalance, remove guitar string squeaks with Spectral Repair, fix clipped audio, hum, pops. This kit of four essential audio cleaning plug-ins—De-click, Dialogue De-noise, De-hum, and De-clip—is curated directly from iZotope’s award-winning RX software and offers the same industry-leading technology used on major label releases, network television, and Hollywood films.
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Overview
De-reverb gives you control over the amount of ambient space captured in a recording. It can make large cathedrals sound like small halls and make roomy vocals sound like they were recorded in a treated space.
De-reverb processes audio according to the reverberant/direct ratio (also known as wet/dry ratio) detected in the signal. It can learn your audio to suggest some frequency and decay time settings, or you can estimate these yourself.
Controls
- LEARN: Teaches De-reverb how much reverb is in your signal.
- The Learn feature analyzes the signal and determines the wet/dry ratio per frequency of your signal, as well as the overall rate of decay of reverb.
- When the Learn operation completes, the Reverb Profile and Tail Length controls will be set to their suggested values.
- The Learn operation can be performed on any reverberant audio.
Recommendation
- We strongly recommend using the Learn feature on a selection of audio that starts with some noise floor (or room tone), is several seconds long, and includes both the direct signal and its reverberant tails.
- We strongly recommend using the Learn feature on a selection of audio that starts with some noise floor (or room tone), is several seconds long, and includes both the direct signal and its reverberant tails.
- The Learn feature analyzes the signal and determines the wet/dry ratio per frequency of your signal, as well as the overall rate of decay of reverb.
- METERING
- The top meter shows a comparison between the input and output signal energy over the past five seconds of playback.
- The bottom meter shows the amount of reverb reduction over time. It is the difference between input and output plotted on a flat line.
- Both of the meters together give you an idea of what De-reverb considers reverb and help you refine your settings.
- The top meter shows a comparison between the input and output signal energy over the past five seconds of playback.
- REDUCTION: Controls the applied amount of De-reverb.
- Larger amounts mean more reverb is removed.
- Smaller amounts perform less processing.
- This control represents the target wet/dry ratio for processing. In other words, if it is set very high, it will treat the signal as though it has more reverb and process it more.
Note: Negative Reduction Values
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- Negative Reduction values will increase the amount of reverb in the signal.
- Negative Reduction values will increase the amount of reverb in the signal.
- Larger amounts mean more reverb is removed.
- REVERB PROFILE: Controls the amount of De-reverb effect applied per band.
- These controls are set automatically by the Learn feature.
- If a group of reverberant tones are more prominent in a signal, increase the control for that band.
- Generally you want to set these controls to match the reverb originally present in your signal. For example, if reverb takes longer to decay (or is more present) in a particular band, set that control higher.
- These controls can also be used to address more prominent ringing or resonant groups in signals. For example, increasing the profile control for low frequencies can remove muddiness from a resonant bass guitar, while increasing the high band control can curtail ringing sibilance in live vocal recordings.
- These controls are set automatically by the Learn feature.
- TAIL LENGTH: Controls the decay of De-reverb processing. This control is an approximation of RT-60, the rate of time it takes for a reverberant signal to decrease in amplitude by 60 dB. This is automatically set by the Learn feature.
- Increase this control if reverb tails reappear after processing, or if early reflections are too apparent.
- Decrease this control if reverb tails and noise floors sound over-processed, or if the processed audio sounds dull.
- Setting this control to the minimum value is effective at processing early reflections.
- Increase this control if reverb tails reappear after processing, or if early reflections are too apparent.
- ARTIFACT SMOOTHING: Controls the frequency accuracy of De-reverb processing.
Artifact Smoothing Default Value Note
- Because reverb is generally smooth across the frequency spectrum, the default value of this control is very high.
- However, if you need more accuracy to address issues like resonant tones in a room, you can decrease this control. The tradeoff is generally more artifacts from strong processing, so you may have to balance adjusting this and the Reduction control.
- Because reverb is generally smooth across the frequency spectrum, the default value of this control is very high.
- ENHANCE DRY SIGNAL: Increases the level of the direct signal.
- Boosting the direct signal can help create more dynamic range in the signal, and is a good option to try when working with voice or transient material.
- Enabling this option can also help prepare material for later de-noising.
- Boosting the direct signal can help create more dynamic range in the signal, and is a good option to try when working with voice or transient material.
- OUTPUT REVERB ONLY: Changes the output of De-reverb from the processed signal to the wet reverberant signal.
- This is useful for monitoring the processing to get better results. Hearing just the reverb helps you understand the impact of controls like Reduction, Reverb Profile, Tail Length, and Artifact Smoothing.
- When this option is enabled, the output may not sound much like reverb because it is the difference of processing against the original signal, with some enhancement to expose more of the reverb apparent in the recording.
- This is useful for monitoring the processing to get better results. Hearing just the reverb helps you understand the impact of controls like Reduction, Reverb Profile, Tail Length, and Artifact Smoothing.
More Information
What are early Reflections?
Early reflections are the rapid echoes of a direct sound from a nearby surface. They are often distinct from the rest of a reverberant tail because they have a lot of energy but end quickly. Early reflections typically comprise the first 5 to 100 milliseconds of a reverb tail.
Using De-reverb as a real-time plug-in
- De-reverb is available as a VST/AU/RTAS/AAX real-time plug-in.
- However, due to the complexity of this processing, it can be resource intensive.
- To achieve high-quality results, it is always best to bring the audio file in question into RX Audio Editor (via RX Connect or by opening it directly), applying De-reverb, and then returning the file back to your original session.
Tips for Learning a Reverb Profile
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- To find the best settings for your signal quickly, find about five seconds of audio that starts with noise and has both direct signal and reverberant tails.
- If you can find enough direct signal and reverberant tails to fill the De-reverb signal trace meter while using Learn, you will probably get a good reverb profile.
- If you can find enough direct signal and reverberant tails to fill the De-reverb signal trace meter while using Learn, you will probably get a good reverb profile.
- Direct signal, reverberant tail, and noise are all important to help De-reverb understand your audio and set its controls appropriately. It needs to understand the ratio of dry signal to reverberant signal, how long reverb tails last, and where the noise floor of your signal is (to avoid excessive processing).
- If you have trouble getting good results from the Learn feature, you can try:
- learning on transient broadband audio, like drums, claps, or coughs
- learning on any audio that is obviously reverberant
- learning for a longer amount of time. Most reverb can be analyzed in a few seconds, but some reverb profiles can require up to ten seconds of analysis.
- learning on transient broadband audio, like drums, claps, or coughs
- Does De-reverb processing sound unnatural?
- **If the output of De-reverb sounds unnatural after Learning, try slowly decreasing the reduction control.
- **If the output of De-reverb sounds unnatural after Learning, try slowly decreasing the reduction control.
Visual Example of De-reverb processing
De-reverb has the effect of sharpening a signal in time. You can see this transition in the spectrogram: reverberant audio looks blurred, and cleaned audio appears more focused.
Here, a recording of a distant speaker (left) has had its long tails processed (center) before another De-reverb pass with shorter tail lengths to tackle the early reflections (right):
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Tips for dealing with complicated reverbs
If the audio you are working with has a very complex reverb, such as a reverb with apparent early reflections, you may get better results after trying a few passes of De-reverb.
- First, start by training the De-reverb and set the Reduction amount to a value that yields good results on the long reverberant tail.
- After processing, Learn a new reverb profile and try reducing the level of early reflections: set the Tail Length control to 0.5, Artifact Smoothing around 3.0, and increase Reduction.
- A combination of De-reverb and Spectral De-noise can be used to tame very reverberant signals. It does not matter whether you process with De-reverb or Spectral De-noise first.
In the past, I’ve had numerous instances where I’ve recorded a vocal or voice over in not the most ideal of rooms. Rooms that are maybe a bit too big for the vocalist or that aren’t treated to absorb room reflections and ambiences. I wish I could have had a plugin like RX back then. When I got my hands on RX the first thing I wanted to try was the De-reverb feature, and man was I impressed. Let me walk you through how RX works regarding removing room ambiences to correct those not so ideal recordings.
Your Over-Room Ambience Recording
So for demonstration purposes, I have recorded a vocal in a room that is not the greatest for voice recordings. Here is the vocal recording. It is a medium-big sized room that is open-plan to the adjacent rooms. So it’s not isolated or treated like a proper vocal booth or dedicated voice recording rooms. You can hear the room ambience and even though I’m using a broadcast dynamic microphone, which tries to reject any external voice, it is still not the best recording. Now let’s put RX's De-reverb to the test.
Original audio:
Loading Up De-reverb
First let's take a look at how to use RX as a plugin in your DAW, and then how you can use it as a standalone audio editor, as well as the extra features it has in the mode.
So in your DAW, add the RX De-reverb module as an insert plugin. You’ll see from your plugin list that you can add an instance of the RX module. Choose the De-reverb.
Then you need to learn the reverb type in the audio. To do this, click on the learn button and then play back the audio in your DAW. While playing back, the plugin analyzes the audio and sets up the parameters to what it thinks will remove the reverb from the sound the best.
Listen back—it does quite a good job. Notice how most of the reverb has been removed. That’s quite impressive!
After De-reverb Learn:
Editing the Parameters
Perhaps you want to tweak the results even further? Maybe too many artifacts have been introduced. Then you can dial back the Reduction fader, and even increase the Artifact smoothing dial to reduce this. If you tick the Enhance dry signal, this can also help, but may also introduce more artifacts. So it’s a bit of a balancing act, but I haven’t seen a plugin before that has as good results like this one, nice work RX!
You can also tick the ‘Output reverb only', and then hear just the reverb signal in the audio. Plus you can go in and change the amount on the Low, Low-mid, High-mid and Highs. So you have quite a bit of flexibility in altering how the reverb is removed.
In Standalone Mode
Standalone mode, or the Audio Editor mode, is slightly different in how it operates, as well as having some extra features not present in the plugin modules. Open up the standalone version of RX, and then drag the audio into the audio window. This will display the waveform.
Now select the audio waveform—you can use the shortcut Command-A (Mac) or Control-A (PC). Navigate to the De-reverb module on the right panel.
Click the learn button to analyze the audio. You’ll see you don’t need to play back the audio. It’ll do the analysis without the need to playback in real time.
The rest is pretty similar to the plugin. You can edit the reduction amount, and the EQ bands. What is different is that you have different undo/saved states in the bottom right. When you first load your audio track, it’ll have the Initial State, and then each time you analyze the audio, it’ll create a new state. So you can compare by jumping back to the initial state, or make new states and compare the De-reverb settings.
Ambient Match
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Another cool thing you can do in the standalone mode is use the Ambient Match feature. So let’s say you’ve gone in and edited out the gaps between the voice in your recording. This tends to break up the continuity of the sound in some cases. So what works well is to insert bits of the room ambience back into the sound. And the Ambient Match feature makes this super easy. Just make a small selection of an area on the audio waveform that contains some room ambience. Then choose the Ambient Match module on the right panel.
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Click on the learn button, and the room ambience in the track will be recreated. You can then either click Preview to hear how it sounds. If it’s not quite right, you can fine-tune your selection and learn it again. Then click Process to add this to the audio.
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Conclusion
That’s how easy it is to use the De-reverb module in the RX Audio Editor to remove and clean up the reverberated signal in your audio. I found that the plugin had removed quite a bit of the ‘background sound’, but at the same time, you could go in and tweak the parameters if you wanted to reintroduce some of that background noise back in, or edit how it was being removed in the different frequency bands. Plus you can use the Ambient Match feature to pull in room ambience that may have gotten removed when you edited the audio, which always comes in handy when you're doing hard edits on audio such as dialogue. This feature helps in making the audio feel more seamless after the edits. I’d really suggest using an application like RX if you are involved in quite a bit of voice and dialog work. It can help improve your voice recording and even save recordings you didn’t think you could even use.
Learn more about how to repair audio using iZotope RX with these video tutorials.
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