@didée
i didn't mean u w/my comments but the abcxyz addicts
as regards spline16, yes, it produces much less ringing. speed? dunno. more or less the same. worth to give it a go.
what i meant by 'moving resizing in' is quite simple. chainmax's script contains a separate resizing step which is unnecessary if the downsizing step after the oversampling would target the final size. i would do it this way, but it's just a clue.
the bests
y