While using blend nodes, you can control the degree of blending with an Alpha value. You can manually assign a blend node's alpha value, by selecting the variable input node, or the alpha property in the node's details panel, and entering a value. You can also assign a blend node's alpha by connecting an alpha variable node to the alpha input pin in the AnimGraph. An alpha value of zero will typically favor the primary pose, while a value of 1 will favor the secondary pose.