This option selects which window function the spectrum bar applies to audio prior to the FFT, to reduce spectral leakage. All functions are bell-shaped or triangular, except for the rectangular window.
| Bartlett | triangular |
| Blackman | higher-order generalized cosine |
| Blackman Harris | higher-order generalized cosine |
| Hamming | minimizes the nearest side lobe |
| Hann (AKA Hanning) | classic raised cosine |
| Rectangular | brick wall |
| Welch | parabolic section |