[fpc-pascal] Good FFT example anywhere?

[Marco van de Voort]

In our previous episode, Bo Berglund said:
> Turbo-pascal and the like...
> So maybe someone here knows about some open-source example of FFT
> using FreePascal (or Delphi)?

When I looked around I was also pointed towards IPP and FFTW, but shied away
from the license consequences (reapllying every 12 months
https://software.intel.com/en-us/faq/free-software and GPL resp)

There is a fairly decent performing unit set under MPL out there by Nils
Haeck, that also performance well for samples sizes that are not a power of
two:

http://www.simdesign.nl/fft.html