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I´m in the process of digitizing a tape which features 90's dance tracks recorded from FM, but the problem is that some idiot (me at age 12) used to change the recording volume constantly between tracks instead of keeping a constant and uniform volume for all tacks.

After individual track click removal and normalization effect, the overall volume has dramatically improved, but it's far from perfect, as you can see from the waveform below:

enter image description here

Clearly the inner waveform (light blue) from the second and the last tracks have a much louder amplitude (and do sound louder). Messing around with the Normalize Loudness effect didn't help at all, or I'm using it improperly. My goal is to normalize all tracks loudness to achieve an uniform loudness and waveform along all tracks, as if no one have ever messed with the recording volume knob 25 years ago. Any suggestions are welcome, thanks.

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  • How was this audio captured? It could be phasing if it wasn’t recorded solo, mono mic.
    – but like
    Jul 16 at 0:28

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There's a difference between Normalisation to absolute loudness & perceived loudness.

Standard Normalisation is absolute. It will turn the track up until the highest single peak reaches 0dBFS [deciBels full scale] (or whatever maximum loudness you have set). This leads to less dynamic tracks appearing to be louder than more dynamic tracks.

Modern streaming services now use perceived loudness instead - this was partly to combat the loudness war - but gives the wanted effect of tracks generally appearing to all be at about the same level.

Different streamers use different values for this, but a partly [or grudgingly] agreed-on standard seems to be -14LUFS [loudness units full scale]. This has the benefit of turning down the most heavily-compressed tracks & turning up the least compressed, all in such a way as to avoid inter-sample peak values above 0dBFS when converted to lower-quality mp3 etc for streaming, thereby preserving quality slightly.

Back to Audacity… you can find this in Effect > Loudness Normalisation… [the opening paragraph is discussing TV loudness, which is lower than 'radio', hence the -23 mentioned in there.

enter image description here

Anecdotally - after more than a decade of constantly chasing the volume on my in-car audio, I recently found a bulk converter utility that enabled me to set my entire iTunes library to -14LUFS in such a way that iTunes itself didn't know anything had changed [thus preserving playlists, counts etc]. As a result, there is considerably less swearing & volume chasing… at long last ;)

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  • I think the issue is that the OP doesn't know what a "Track" is. They think that a "track" is a "song", however in the context of a DAW, a track is something different. They need to normalize song by song, in stereo rather than track by track which is what they have done.
    – Mark
    Jun 30 at 23:53
  • @Mark - I'm not sure, but I get your point. Audacity works on 'selected bit' [you can tell I only dug this out to test just now, never use it otherwise] & the OP has separated 'areas' [files or just soft edits, idk]. They would logically select area by area [one appears to be selected in their pic] & apply the same processing to each. We'll have to see if they come back to confirm or deny this assumption, I guess.
    – Tetsujin
    Jul 1 at 6:37

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