If you click on any place of the schematic sheet, "Parts Select" dialog appears. Then please choose BTWLPF (Butterworth Low Pass Filter). After you place BTWLPF, please double-click on it. Then "Parts Attribute" dialog appears and please click "Change Parameters". Then "Butterworth LPF Parameters" dialog appears. Please click "Quantize Coefficients" button. Check "Quantize by", choose "Dec" and set the bits "16". Next

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