[ql-users] filters again

[Arnould Nazarian]

Sorry but I come back to filters with multiple input channels.

If
        ex filter_bas,input_file1,input_file2,output_file
does not work,
but
        c1=fop_in(input_file1)
        c2=fop_in(input_file2)
        ex filter_bas,#c1,#c2,output_file
        close#c1:close#c2
does work,
then I have the tendency to think that (please remark my precautions) 
there is a bug, not a feature. What do you think? And am I the only one 
having found this feature/bug after 20 years?

Arnould