So, the problem is the discrepency I’m seeing between animations in Maya and Unity.
We have a simple, static pose in Maya, with an additive Breathing cycle layer.
In the Gif, the white woman has the Pose and Breathign Cycle exported as separate FBXs, then the Breathing is applied as an additive layer in Unity.
The brown woman has the entire thing exported as a single FBX from Maya and played in Unity.
You can see how very different the chest position/movement range is with the Layered-In-Unity version.
Can anyone shed any light as to why this might be?