Replace a time range on one axis with a described motion (sections, the same as play_motion) or with exact points. With sections the motion starts at from_ms and replaces what was there until it ends. With actions the points keep their own times, or are moved so the first one lands on from_ms. The motion is fitted to 400 units per second like the Speed Limiter unless fit_to_device_speed is false. Lands in the editor at once as one Undo step. To add, move or delete single points without replacing a range, use edit_points.