I've added an IpoCurve.New() function to create unwrapped IpoCurves, which can then be assigned to Ipos: ipo = Ipo.Get('ObIpo') ipo['LocX'] = IpoCurve.New((0,1,0)) Problem is, I don't see how to document IpoCurve.New since there is already an Ipo.New, and both are functions. Ken