A tutorial that covers different noise patterns can be found here.
This shader outputs a float value and therefore may prove unpredictable when connecting it to something like a gobo filter which requires color values. A workaround is to build an RGB color from the output of the Noise texture using the float_to_rgb shader.
The Pref attribute must be of type "Float" (size 3) and sub-type of "Position". In Arnold terms, it's userdata of type PNT. To add Pref to an object first create a rest node to make the reference pose and then create a Pref attribute.