What does the FFT data in the Web Audio API correspond to?

Yes getByteFrequencyData results in a normalized array of values between 0 and 255. (it copies the data to the array it gets passed-in).

With 256 bins, each one will be ~86 Hz apart (44100 kHz sample rate / fftSize, where fftSize is twice the number of bins). So you start at zero and go up in 86 Hz increments from there.

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