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Submitted by Joe on Thu, 11/19/2009 - 05:30 I think is is very cool that I can design a Butterworth, Bessel or Chebychev filter, and choose low pass, high pass, band pass filtering using the filter design wizard in the transfer function block. The resulting filters always seem to work as expected. However, when I convert it to Z domain using the S->Z button, and then convert it back, usually the resulting filter is very different from what I started with and doesn't work well at all. How come?