The veining channel controls the size and mixing of the two vein surfaces. You also can change the relative color variance and turbulence of the veins as well. There is only one veining group that is shared by both surfaces.
This group of parameters contains attributes of the veining function. The function is basically an alternating gradient on the Y axis that can be perturbed using a noise function.
This value influences the noise dispersion for Noise Shaders. Different Start Values will result in different noise dispersions.
Noise function used to perturb the veins (look up noise types).
Amount of distortion applied to the veins.
The scale of the stirring noise function.
Octaves of fractal detail used in the stirring function.
Size of the veins (Surface1) to the body (Surface 2).
Contrast applied to the veins to make them blend smoothly or separate distinctly.
Noise function used to vary the veining.
Amount of variance applied to the veins.
Octaves of fractal detail used in the variance function.
The scale of the variance function.
Contrast applied to the variance noise.