The "grid" example shows a similar effect, but the difference is even more stark. With Low Cut Frequency at 0%, slowly move the High Cut Frequency between 7% an

The "grid" example shows a similar effect, but the difference is even more stark. With Low Cut Frequency at 0%, slowly move the High Cut Frequency between 7% and 9%, on the "Modulus view" you should see the white dots which represent vertical bands in the "Inverse transform" get cut out, so the "Inverse transform" switches from a fuzzy grid to just horizontal bands.