I’m not a control rig user, but this looks like a different system than my example. I am telling the actor to check where it is supposed to go every frame, and that’s in game on the Tick function. This way of rigging it where you can define an arbitrary point on the spline and have it update in sequencer is a little outside my understanding. To get something similar with my system you would use Take Recorder to record the vehicle on the spline and then scrub the resulting animation in sequencer as you see fit.