suni,
I don't know which one off hand would solve your problem. If it was me, I would mess around with the other transforms LabVIEW provides (Functions Palette>>Signal Processing>>Transforms) and see if that gets it for you. I hate to be so broad in my answer but I have never used the Tustin transformation (I actually had to Wikipedia it to see what it was doing). Sorry for not being so helpful but I am glad you got your other questions answered!!
