Christian won't be around until at least the end of the month. He's spending most of his time at PowerDivX.com now though, so if you want to reach him, that's where you'll find him most likely.
Soft bicubic is not a filter in VDub, but a modified setting in Avisynth:
Soft Bicubic -> BicubicResize(x,y,0.333,0.333)
Neutral Bicubic -> BicubicResize(x,y,0.5,0.5)
Sharp Bicubic -> BicubicResize(x,y,0,0.75)
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