Noise module that selects and blends between two source modules based on the value of a selector module. Whenever the selector module returns a value below the selection threshold, the lower module's noise value is selected; if the selector module returns a value above the threshold, the upper noise module is used instead. To smooth the transition, a falloff distance may be provided, over which the two modules will be blended together in proportion to the selector module's value.
If you are using the included XML noise configuration system, Select modules can be declared as
<select falloff="falloff" threshold="threshold" >
<lower source module />
<upper source module />
<selector module />
</select>