The Cluster Object in C4d doesn’t work with spline points which is a huge pity. Using MoSpline, a MoGraph Selection Tag and a Plain Effector you can build your own Point Cluster. I admit that this is something of a hack/workaround, but you gain full control over what happens. Keep in mind, that this setup doesn’t work with Bezier Splines and rotations of the Mover Object aren’t assigned to the points, maybe one of you have an idea about that? (no audio)