File:Mainshum.png: Revision history

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24 January 2016

  • curprev 12:4912:49, 24 January 2016‎ RuthieG talk contribs‎ 183 bytes +183‎ This image shows how to identify the frequency or frequencies of background noise, by selecting a couple of seconds of background noise, and using Analyze | Plot Spectrum in Audacity.
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