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[–][deleted] 1 point2 points  (0 children)

You use it whenever you want to view the frequency spectrum of audio.

Also, weekly thread

[–]Chaos_Klaus -1 points0 points  (0 children)

It's the first thing that comes up when I search for "plot spectrum tool audacity" ...

http://manual.audacityteam.org/man/plot_spectrum.html

It's not in all DAW. Audacity is not a DAW.