This Track is Legacy. Please use the Animator Track.
The Mecanim Track works closely with the Animator component which is required to be attached to the target actor and is responsible for playing mecanim animations by setting the Animator Controller’s state directly, or by setting one of its parameters. The animation is fully previewable in editor as well.
The following clips can be added to the Mecanim Track:
TIP: In case you do not need the parameter to be blended out to its original value, you can simply set the Blend Out property of the clip to zero (clamping the clip effect).