Transform

Transforms the entire MASH network.

Position, Rotation, Scale: Transforms the entire MASH network using the respective transform operation.
Scale Points: Scales the individual points along with the network.
Controller Null: Displays a null object for your MASH network to inherit transforms from. Allows you to interactively transform your network in the viewport. You can right-click to create a new object (a locator), middle-drag a transform into this field, or right-click to connect the selected mesh. If a mesh is already connected, you can also right-click to remove or show it in the Outliner.

Strength

Position, Rotation, Scale: Determines which transforms the Strength setting affects.
Strength: Fades the node's effect for all the objects at the same time.
Random Strength: Smoothly fades the node's effect on all the objects in a random order.
Step Strength: Turns the node's effect off one object at a time.
Strength Map: Determines the input file (2D texture, animated texture, etc) that controls the shape of the node's effect.
Map Projection Axis: Determines the axis along which the Strength Map is projected.
Map Helper: Displays the object being used to interactively place the Strength Map in the scene. You can right-click the field to create a new helper object (a plane) if none exists. You can also middle-drag a mesh into this field or right-click to connect a selected mesh. If a mesh is already connected, you can also right-click to break its connection or show it in the Outliner.
Note: For the best results, assign the same texture to both the Strength Map and the Map Helper (this automatically happens when creating a new helper object).