This is the end of AVICII's The Nights (YouTube) viewed in Audacity:

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Question: Is there a particular purpose for keeping the wave out of the center?

I guess it does not change the sound (or at least not in a way that humans can hear), but maybe there are merits I have not thought about? Or maybe it is just for the visual effect of the diaphragms coming back to position after the music stops, for instance? Or to prevent people/programs from cutting the track as soon as the music stops, maybe?

  • It's not clear how did you get a youtube track playing in audacity... is the method reliable to begin with? Does the recording method do the same for different tracks? But the main question is why would it necessarily be centred? A lot of classic waveforms, especially when you work with harmonization are nor centred. – Bebs Apr 9 '19 at 10:12
  • I don't know the reason for this perticular track, but I used to work on some audio effects that consisted on "un-centerize" a waveform in order to create harmonics, for example, take a sine wave and replace negative by zero. – Bebs Apr 9 '19 at 10:21
  • @Bebs: Did you left the waveform uncenterized on purpose? Or did you just left it like this because centering it would waste a few minutes of work for no noticeable benefit? – Nicolas Raoul Apr 9 '19 at 12:18
  • In my case, I didn't think about it back then... but to center the signal, it is needed to know its mean. In real time applications, the mean can vary so re-centering the signal (i.e. removing its mean which is not constant) would require processing costs and could actually add an unwanted audible effect. – Bebs Apr 9 '19 at 12:45
  • @NicolasRaoul, people don't intentionally un-center the waveform. They apply wanted sound effects that have side effects to un-center the waveform. Un-centering is a consequence, not a purpose. – Bebs Nov 12 '19 at 14:27

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