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I need to import an mp3 or an ogg file and analyse it through an oscilloscope. Is there any free (as in beer) software to do so? I am aware of xoscope, but in the internet I have only found tutorials that show how to let it work whenever sounds are imported through the micro. I would like to simply "open" a file and start the analysis. Is there anything that does so in a simple and reliable way?

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What kind of analysis are you to conduct? – K7AAY Oct 21 '13 at 16:12
well, "analysis" is probably an exaggeration. mostly, i would like to show to my students what is an overtone, what are partials and so on. – Delio M. Oct 21 '13 at 16:39

I should think audacity would be able to do this.

EDIT: OK, Well, I'm not up with all of the Audio jargon, so here's a few things I found: Spek (and its GUI, pulseview) and Sonic Visualiser and I also found this page, which contains many links to different software for Linux.

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thanks phpdev. unfortunately, in my version of audacity (2.0.1) there is no oscilloscope, but only a spectrogram, and i was not able to find any reasonable plugin to enable an oscilloscope-like visualisation. – Delio M. Oct 21 '13 at 19:23
Added more info. – thephpdev Oct 22 '13 at 8:29

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