Transitions are one of the most powerful features of Motion Mixer. They allow you to blend motions together.
Ignore the time slider in the curve window, if you’re scrubbing the animation in Layout. It does not reflect the position within a transition.To smooth out the transition, you simply set the Tension to 1 for both Incoming Curves (they are both TCBSplines). You can do this quickly by selecting both keys and right-clicking one of them and selecting Ease In/Out from the pop-up menu.