 After clicking OK three times to close dialogs, please left-click on BTWLPF
to select it and right click to choose "Open a Monitor".  Then its frequency response appears. Please choose Tools -> Save Coefficients
on the menu.  You can save the coefficients into an appropriate directory.  Let's open the file. You may find "b1" exceeds the limit of signed
16-bits, that is -32768 to +32767. 
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