OK,

Here's the 1D FFT scene.
I removed a bunch of extraneous cruft.

I add 5 sine waves of different frequency to get the black curve.
The yellow lines indicate the frequencies of the component sine waves.
The magenta lines are the output of the FFT.

I have no idea what the negative magenta signal near 0 is.  Maybe some 
kind of "ringing" artefact?

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