Version: 2018.2
public void RemoveMixingTransform (Transform mix);

説明

アニメーションすべき Transform を削除します。

You can only pass transforms that have been added through AddMixingTransform function. If transform has been added as recursive, then it will be removed as recursive. Once you remove all mixing transforms added to animation state all curves become animated again. See Also: AddMixingTransform function.