so as I understand you Zion, schwerts script takes two versions of the capture and is overlaying them so you have half the fields from one, and half the fields from the other, then around V5 line combining the two back together into a single 23.97fps ivtc source which is anti aliased, color corrected and sharpened up?

so in my case, as I have a IVTC source file with jaggies, all I need to do is run sangnom as a normal filter

avisource=("p:\anh\interim\anh_interim.avi")
sangnom(order=x,aa=x)

rather than structuring it as schwert has done