Timeline Mixer adds more playback options for Unity Timelines, allowing you to create silky smooth fades and transitions between Timelines that are not easily possible with the Playable Director. A Timeline with an animation track can be faded in or out, resulting in a seamless transition between other Timelines and Animator Controllers.

Or if you're not looking for easy transitions, Timeline Mixer also lets you manage all of your timelines on one component, no need for multiple gameobjects and Playable Directors.

This tool has been designed with ease of use and the user experience in mind, making the switch from using Playable Director components to Timeline Mixer very simple.

Find it on the Unity Asset Store here