Viseme Bone Chains
After selecting a Bone Chain to Edit, the Bone Chains will be visible on the Avatar. Click and drag the various anchors and rotators to adjust the facial expression. You can build up a library of presets from variations you favor, they will save along with the Brain File.
Viseme bone chain rotations around the mouth and jaw will override the Facial Expression bone chain rotation but will retain expression around the eyes and nose bride and outer cheeks so a speaking performance is not just locked to Viseme Shapes but the surrounding face can add to the speaking performance.