
Processing before mixing
https://www.izotope.com/en/learn/vocal-mixing-basics-how-to-make-vocals-cut-through-the-mix.html

https://www.izotope.com/en/learn/8-common-audio-restoration-mistakes.html
Identifying Audio Problems in the RX Spectrogram
RX Elements Overview
RX 6 | Vocal Editing Overview
Edit Podcast Vocals with RX Elements
De-Clip
https://www.izotope.com/en/learn/how-to-fix-audio-clipping.html
iZotope RX Plug-in Pack | Using the De-clip Plug-in to Fix Clipped Vocals
De-Noise
iZotope RX Plug-in Pack | Using Dialogue De-noise to Clean Up a Dialogue Track
De-click
RX 6 | Mouth De-click Tutorial
De-ess
RX 6 | Spectral De-ess Tutorial
Remove breaths
iZotope RX | Remove breaths and mouth noise from your dialogue
Remove noise
Fix Room Noise on Guitar Recordings with RX Elements
Repair
RX 6 | Spectral Repair Overview
RX Audio Repair Master Class | iZotope RX 5 Audio Editor Tips & Tricks
RX 6 | Instantly paint away audio problems with Spectral Repair
Tips from a Pro | Audio Repair in Music Production: Removing Plosives and Mouth Clicks
De-bleed
RX 6 | De-bleed Tutorial
Tips from a Pro: Audio Repair in Music Production: Removing Sudden Unwanted Sounds
How to Remove Unwanted Sounds from a Take | iZotope RX
Tips from a Pro: Audio Repair in Music Production: Removing Hum and Buzz
RX Audio Repair Master Class | iZotope RX 5 Audio Editor Tips & Tricks
Solve Common Audio Issues with Repair Assistant in RX 7
RX 7 Standard features
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Music Rebalance
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De-bleed
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Breath Control
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Repair Assistant
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De-reverb
https://www.izotope.com/en/shop/rx-7-standard.html
https://www.izotope.com/en/products/rx/features.html
How to Use Music Rebalance in RX 7
Isolate a Vocal with Music Rebalance in RX 7
https://www.izotope.com/en/learn/isolate-a-vocal-with-music-rebalance-in-rx-7.html
Another plugin for isolating vocals https://products.zplane.de/peel
Tutorial: Using RX 7 for Music
How to Isolate and Remix an Acapella/Vocal with iZotope RX7 | Music Rebalance Tutorial
Telling Stories with iZotope RX: Powerful Dialogue Editing, Part 1
Telling Stories with iZotope RX: Powerful Dialogue Editing, Part 2