You can create custom shapes for additional facial expressions and animation that do not match the Generic and Voice shapes. For example, you can create custom shapes for additional eyebrow, nostril, and cheek movements.

Custom shapes should be independent from the supported Generic and Phoneme shapes so that you can blend them to other shapes.

For example, a custom forehead expression should have its own shape. This lets you blend it with other facial expressions and phonemes, instead of only applying it to a specific movement.

Refer to Choosing shapes to create for a guide to creating phoneme shapes supported by the Voice device.