In what units does frequency fft return values?

[ImJimmi]

@daniel

@CustomPhase

more or less acceptably correct, just by using log(2 * level / fftSize)

That seems like a good starting point. Can somebody with good elementary maths skills comment on that, if that is the right approach, or is it just approximating?

When I start to add a serious analyser to my projects, I would want it to be based on proper maths rather than guesswork…

The output from preformFrequencyOnlyForwardFFT() is in the range 0 to the size of the FFT.