This is the setting that gives the greatest speed since the Fourier transform is executed fastest when the length of the data is order of two, e.g. 1024 which is 2^10. If the windowed data does not have a order of two length, the data must be padded. E.g. if the length of the windowed data is 700 samples, the data are padded to obtain the length 1024. Usually zeros are used for this padding, therefore the name Zeropadding, but WinMLS does not pad zeros, instead it pads the last value of the windowed data. This is done to prevent from errors in case the data has a DC-component. Note that because this method is applied, this setting should not be used with a Rectangular window on non-transient data (this is not recommended anyway).