Compute (ConstantA * A) + (ConstantB * B) for each pair of values in ScalarListA and ScalarListB and return in new ScalarList.Bydefault (constants = 1) this just adds the two values. Set ConstantB = -1 to subtract B from A. Can also be used to Linear Interpolate, by setting ConstantB = (1-ConstantA)