The Capture to Custom AOV node can be used to apply a texture to a custom AOV pass (figure 1).
Figure 1: A Procedural Noise node is used with the Capture to Custom AOV node to add the noise pattern to the AOV matte
Figure 2: The node network used in figure 1
Once a Capture to Custom AOV node has been connected to a material network, the custom AOV needs to be activated in the AOV tab for the Octane Render Target. See the section on Render PassesRender passes allow a rendered frame to be further broken down beyond the capabilities of Render Layers. Render Passes vary among render engines but typically they allow an image to be separated into its fundamental visual components such as diffuse, ambient, specular, etc.. for more information on using the Octane AOV passes.