I know that unity timeline have interface below: Code (CSharp): PlayableOutput.AddNotificationReceiver TimeNotificationBehaviour.AddNotification they accept time parameter both. They work on editor mode, but unfortunately I did not find any interface about [deleting] notification. Why I need these interface? 1 I want trigger event on every clip at begin or end by code, and I don’t need do it by adding marker on timeline editor manually. 2 I wish to loop at specific clip. 3 I do not want to create a notification every time for reducing gc. any help, please.