TAE files govern the specific events that occur during animations. Sounds, particle effects, and hitbox customization are a few functional examples. A TAE file contains a list of animations, each of which contains a list of Time Action Events. These events have a type field which indicates the function to be performed at the specified time indices of the animation.
DS1/DSR -- inside *.anibnd files in the chr directory.
Only a handful of event types are fully understood, but they can be safely modified and rewritten without affecting the rest of the file.