So looking at the wiki page for the Spectrum CHOP I see this:

I then tried that out, using a 440Hz sine wave as the input, and according to the spectrum CHOP, sample 11 was showing the peak magnitude. So I assume that this means sample 11 should represent around 440Hz, but when I plug in to the equation what I get is:

2 * 11 * 44100 / 735 = 1320

I would love any help in understanding this, maybe I have it all wrong or just my math is wrong. Attached is the sample file I set up.

Thanks!

spectrum_test.toe (7.05 KB)