A pencil line can be drawn with a texture but also painted with a texture swatch. With the Colour-Override module, you can either override either the pencil line's texture or texture fill and replace it by another one or you can also animate the texture's position.
With the Edit Gradient and Texture tool, you can modify the size and position for both types of texture on a pencil line; the drawing texture and the filling texture. By doing that, you are actually modifying the texture's matrix.
|•||Modifying a Texture Fill on a Pencil Line|
|•||Modifying a Pencil Texture|