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I was able to convert audio cassette to mp3 form, using a walkman style device with built in mp3 conversion, but when I go to listen to the audio, the sound is a little distorted. I am suspecting this is because the tape stretched over time or something equivalent has happened to it. I am sure there is a term for this issue, but I wasn't able to find a good definition.

Is the any tool or process that can help deal with an audio recording of such a source? Ideally for Linux or macOS.

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  • Short of cutting out the stretched section, taping the tape's two ends together with scotch tape, the only other way [AFAIK] would be to use audio editing software (Adobe Audition and similar) to try and clean up the signal (keep in mind, FLAC is preferable, with 320kbps CBR MP3s being the minimum that should be used, especially when trying to salvage a signal, as you want the least amount of information removed from the signal when encoding [compression removes data from the signal])
    – JW0914
    Feb 23, 2021 at 14:41
  • Before you can fix any audio, you need to identify exactly what needs fixing. "distortion, tape stretch or something really doesn't help us to help you. If you do have tape-stretch, wow or flutter, then it can be fixed, but it's about the most expensive fix you could imagine. Only one app exists that can do it & it costs $3790 celemony.com/en/capstan - so it's probably best if you do correctly identify your issue first ;) BTW, don't use mp3 if your audio needs work, record at 24-bit WAV, downsample once it's fixed.
    – Tetsujin
    Feb 24, 2021 at 9:31

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