 And do the same thing on FFTMON (U_3) to monitor the FFT component.  Please understand the spectrum of unit impulse is flat and any frequency
has the same amount. ("1", i.e. 0dB).  Next, left click on WINLPF (U_1, FIR type Low Pass Filter by Window Function
Algorithm) to select it and right click to choose "Open a Monitor".
 Then you will see the frequency response of the FIR Filter. That begin
to decrease its gain from 1kHz and goes to about -80dB. 
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