 Do the same thing on WAVOUT (U_1) to monitor filtered output. You may see
1kHz of sine wave.  Do the same thing on FFTMON (U_3) to monitor another FFT. You may see 3kHz
and 5kHz are decreased.  If you want to see all monitor windows at the same time, please choose
"Window"->"Tile" on the menu. You may find 3kHz
has been decreased by 30dB. That meets the characteristics of CHBLPF (U_4).
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