User Manual
Table Of Contents
- 1: INTRODUCTION
- Intended Audience for this Guide
- About the 2014 Edition
- Additional Resources
- About iZotope
- 2: WHAT IS AUDIO REPAIR AND RESTORATION?
- 3: AUDIO REPAIR AND RESTORATION BASICS
- 4: Understanding Spectrograms / Identifying Audio Problems
- 5: WHAT IS RX 4?
- 6: DENOISING
- 7: TIPS AND TRICKS FOR EDITING DIALOGUE
- 8: BROADBAND NOISE REDUCTION
- 9: REMOVING INTERMITTENT NOISES AND GAPS
- 10: REMOVING CLICKS AND POPS
- 11: REMOVING CLIPPING
- 12: REMOVING REVERB
- 13: EXPORTING AND DELIVERING AUDIO
- Exporting and Delivering Audio in RX 4
- 14: SUMMARY
- 15: ABOUT THE AUTHORS
- APPENDIX A: GETTING SET UP TO REPAIR AND RESTORE AUDIO
- APPENDIX B: GENERAL RX 4 TOOLS
- Appendix C: REPAIRING THE INCLUDED AUDIO FILES
- Example 1: Removing Broadband Noise from a Concert Recording
- Example 2: Restoring an Historical Speech: Making Voice More Intelligible
- Example 3: Cleaning up a Phone Interview with Declick and Spectral Repair
- Example 4: Removing Clicks and Pops from a Concert on Record
- Example 5: Removing Clipping from a Phone Interview
- Example 6: Removing Guitar String Squeaks with Spectral Repair
- Appendix D: Tips from the Pros
143
AUDIO REPAIR
AND ENHANCEMENT
The Declick tool is not just a one trick pony for cleaning up vinyl recording. Its great for removing digital
clicks caused by clocking problems, mouth clicks on voiceovers, and some kinds of distortion can be
cleaned up with the Declick tool.
I have just taken a recording made in a bedroom with very little soft furnishings, and actually had a ping to
it. Ran it through Dereverb and was able to get a result close to as if it had been recorded in a radio studio.
JASON GRAVES
Definitely audition all four algorithms before committing. I always default to the D (best, slowest)algorithm,
even though it takes a little longer to preview in real time, but sometimes B or C actually sound better to
my ears.
If you’re involved in the original recording, always preroll at least three or four seconds of room tone. Then
you’ll have the perfect “handle” to train RX and zap the noise eortlessly.
If you’re hearing too many artifacts reduce the Noise reduction slider by a few dB and increase the
“Smoothing” by a few db. Sometimes even 2-4 dB sounds significantly more natural.
For extreme denoising cases, I’ve found two passes with half the dB in Noise reduction yields more trans-
parent results.
This is hands-down THE best audio repair software out there. I use it on a daily basis—nothing sounds
as natural and transparent as RX. Literally every virtual instrument I’ve recorded and built has been run
through RX. You can hear it on all the strings and brass in the Dead Space franchise and the latest Tomb
Raider game. Or should I say you CAN’T hear it!
ADAM AYAN
Knowing what to denoise and what to leave alone can be tricky in of itself. My general rule of thumb is if a
noise or sound takes me out of the musical moment, or distracts me from enjoyment of the music then it
must go!
BOB BRONOW
There’s always the old chestnut:
The squeaky wheel does NOT get the grease. It gets RX, and is never heard again.