Modo 13.1v1 docs:

Regional HSV

The Regional HSV process layer provides you with a way to control variations in e:Modo textures that output regions (such as the Tiles procedural layers). For the Regional HSV layer to work properly, you must enable Output Regions in the originating procedural texture layer. To use Regional HSV, define a layer that supports the Output Regions options and enable Output Regions. Add the Regional HSV layer set to the same effect type directly above the originating layer in the Shader Tree. You can then adjust the minimum and maximum Hue, Saturation, and Value settings to control the amount of variations in the regions.

Note: For information about adding and working with Shader Tree item layers, see the Shader Tree topic.

Layer Properties

Enable	Toggles the effect of the layer on and off. This duplicates the functionality of toggling visibility in the Shader Tree. When disabled, the layer has no effect on the shading of the scene. However, Modo saves disabled layers with the scene, and they are persistent across Modo sessions.
Invert	Inverts the colors (RGB values) for the layer to produce a negative effect.
Blend Mode	Affects the blending between different layers of the same effect type. With this, you can stack several layers for different effects. For more about blending, see Layer Blend Modes.
Opacity	Changes the transparency of the current layer. If there are layers below this layer in the Shader Tree, reducing this value increasingly reveals the lower layers. Reducing the value always dims the effect of the layer.
Locator	Sets the association for the Texture Locator. Most texture layers have a Texture Locator that Modo automatically creates in the Item List. This defines the mapping of the texture (how Modo applies the texture) to the surface. You can specify alternate locators, but this is normally not required. Although you may want multiple texture items to share a single locator.
Projection Type	Defines how a texture/material is applied to a 3D surface. Types vary significantly in their effects. For a guide to each Projection Type see Sorry you didn't find this helpful.
Projection Axis	The texture/material is projected down this axis. This applies to Planar, Cylindrical, Spherical, Cubic, Box, and, Light Probe projection types.

Regional HSV Properties

Process - Regional HSV
Seed	Specifies the initial number Modo uses when generating the procedural values. Different Seed values produce different random variations and can be useful in changing the texture result; however, you need to use the same Seed value when you want items to retain the same variations.
Hue Minimum	Specifies the low-end hue value that Modo uses to mix the final output.
Hue Maximum	Specifies the high-end hue value that Modo uses to mix the final output.
Saturation Minimum	Specifies the low-end saturation value that Modo uses to mix the final output.
Saturation Maximum	Specifies the high-end saturation value that Modo uses to mix the final output.
Value Minimum	Specifies the low-end intensity amount that Modo uses to mix the final output.
Value Maximum	Specifies the high-end intensity amount that Modo uses to mix the final output.

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Modo 13.1v1 docs: