Question about spectrum pane and key-values

Hi everyone

I’m trying to use the spectum pane to figure out root keys of samples. I found a behaviour which I can’t explan myself, can you guys help me please?

When playing a A4 note, I assume to see the peak at 440 Hz and the note A4. Instead the spectrum plane returns A-5 on mouse-over:

Where’s my error in reasoning?

-Sebastian

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