This add-on is a specialized fork of the Blender Rhubarb LipSync tool adapted for 2D character workflows. It automatically generates lip-sync animation by analyzing audio files and keyframing target properties to match phonetic mouth shapes.

The tool can directly animate a Grease Pencil object's Time Offset modifier, making it easy to swap between drawn mouth shapes on different frames. Alternatively, it can drive custom integer or float properties on active objects or pose bones. Users can configure standard Rhubarb mouth shapes, select their preferred speech recognizer (such as PocketSphinx for English), and automatically plot keyframes based on imported sound files.