Setting up the threshold to 0dB, the smoothing is applied to the whole magnitude response, as shown
in the following picture (left side plot, smoothing disabled; right side plot, smoothing enabled)
When the “Magn+Phase” mode is selected, the phase smoothing is always applied to the whole
frequency range, even if the threshold is not equal to 0dB.
The following picture shows the phase smoothing effect, by comparing the group delay response
before (left side plot) and after (right side plot) enabling the smoothing.
