Then you may find a component FIRFIL(FIR Filter) lower part of the schematic.
Please double-click on it and click "Change Parameters".

Then a new dialog appears. Please click "Change Coefficients"
to set a file of coefficients.

Choose the "response.txt" that was generated by TXTOUT, i.e. the IIR filter's impulse response will become coefficients of the FIR filter.

Let's open a monitor window for FIRFIL to see its characteristics.

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