6 Audacity effects improve voiceover.

1. Noise Reduction

Take flat sample and then reapply after select all.

2. Compressor

Turning down the louder parts. This allows your audio to be amplified without clipping the louder passages.
View > Show clipping

Compressor Effect Settings:
Threshold -12dB
Noise Floor -40dB
Ratio 2:1 for most jobs
Attack 0.20 secs
Release 1.0
Leave the bottom two boxes unchecked

3. Limiter Filter

boosting the quieter part more then the louder passages.

Hard limiter Settings:
Hard Limit for voice overs
Gain 3-4dB
Limit -3dB (single track) to -4.5dB (multitrack)
Hold 2.0

4. Equalizer (I don’t get any benefit from this step).

increase the volume of some frequencies and reduce others.

Settings:
very subjective
Bass Boost preset-OK
Treble Boost preset-OK

5. Normalize

allows gain to be applied to the softer passages.
Do this last.

Settings:
Check Remove DC
Check Normalize at -1.0dB

6. Reverb (I don’t get any benefit from this step).

7. Silence Finder

https://manual.audacityteam.org/man/silence_finder_setting_parameters.html

Effect > Click Removal

Clicking on the command buttons give the following results:

  • Manage gives a dropdown menu enabling you to manage presets for the tool and to see some detail about the tool. For details see Manage presets
  • Preview plays a short preview of what the audio would sound like if the effect is applied with the current settings, without making actual changes to the audio. The length of preview is determined by your setting in Edit > Preferences > Playback, the default setting is 6 seconds.
  • OK applies the effect to the selected audio with the current effect settings and closes the dialog.
  • Cancel aborts the effect and leaves the audio unchanged, closing the dialog.

8. Running Silence Finder

  • Click on Edit > Select > All
  • Click on Analyze > Silence Finder…
  • Enter the following parameters into the Silence Finder dialog:
    • Treat audio below this level as silence [- dB]: 30
    • Minimum duration of silence [seconds]: 1.5
    • Label placement [seconds before silence ends]: 0.1

9. Truncate Silence

  • Highlight the whole recording with your mouse.
  • Click on the Effect menu and then Truncate Silence
  • Audacity uses certain thresholds to decide what is silence. Min Duration, Max Duration, and Silence Threshold. These settings will decide what is considered silence and remove them.
  • Silence Compression determines how much of the silence is removed. Instead of removing all silence, Audacity compresses it. For example, using 3:1 compression, a 3-second period of silence would be compressed down to 1 second.
  • Click OK.