Audacity 3.7.3 review: noise reduction and export, tested on Linux
Noise Reduction at 12 dB, WAV/MP3 export, and measured before/after levels on Audacity 3.7.3; 4.x notes are documentation-only.
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Audacity
Edit interview or podcast audio locally with cuts, fades and noise reduction. Our hands-on check used Audacity 3.7.3 on Linux; Audacity 4.x and .aup4 notes stay documentation-only, and there is no mobile app.
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What we checked on Audacity 3.7.3
On Debian Linux we ran Noise Reduction from the Effect menu (Get Noise Profile, then 12 dB / Sensitivity 6.00 / Frequency smoothing 6 bands) on a synthetic file: pink noise plus 220/330 Hz tones. The noise-only section dropped from −43.69 to −55.69 dB RMS on the WAV export; the tone section dropped from −23.93 to −29.09 dB RMS. WAV and MP3 export worked. A scripted NoiseReduction call returned OK but did not capture a profile until we used the dialog.
Audacity 4.x (documentation only)
We did not test Audacity 4.x or .aup4 projects. Official materials describe .aup4 projects and compatibility limits for older projects, commands and plugins—verify those on the official site before a deadline migrate. There is no mobile app.
Related workflows
Fix a timing problem
Fix subtitles that drift after audio edits
Distinguish a fixed offset from drift or a cut-boundary jump before retiming subtitles.