Mocap Fusion supports Unity's Copy Rotation Constraints, which is useful for multi-arms or making wings move naturally with the avatar's arms.
Add Copy Rotation Constraints on both the Blender model and the Unity avatar so they both move with the identical offsets.
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In this example the constraints are connected to the armature's middle proximal phalanges so the puppet's jaw rotation is controlled by moving the avatar's finger which works when using Index controllers & Vive wands
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Here’s an example of an avatar with Dynamicbone added to the arms, fingers, ears and tail.