 Do the same thing on TXTOUT to see filtered output.  You can see the output of the IIR filter in which we input an unit impulse,
i.e. impulse response, but this is not directly related to IIR filter's
coefficients.  Next, left click on FFTMON (U_4) to select another FFT and right click
to choose "Open a Monitor".  Then you will see the spectrum of the impulse response. Its cutoff frequency
is 1kHz. 
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