 A monitor window appears. This shows you the Wave file is 1kHz of square
wave.  Do the same thing on FFTMON (U_2) to monitor the FFT component.  Then you may see the spectrum has 1kHz, 3kHz, 5kHz....  Do the same thing on CHBLPF (U_4), then it shows you Chebychev LPF's frequency
response. 
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