Thanks, you were correct that using a construction script allowed me to scrub through the cube motion. However my only goal right now is to render out sequences, so the only play button I want to hit is to render a sequence. Fortunately your suggestion led me to further investigate starting blueprints with custom events and binding those events with a repeating trigger throughout the entire sequence. The result is I can hit the sequence play button and the cube moves from spline start to end. Next step is to replace the cube with a skeletal mesh and control rig.