Random pulse effect and strobe on RGB LED fixtures

I'm using a Wholehog III on a tour this month and have a few MAC 2k's that I'd like to get to do a pulse effect similar to what a standard par would do in a chase. Just smooth intensity changes from 0% to 100%, but random. I know that I'll need to Fan but I'm not sure which effect do I use under the intensity effects engine selections? Any advice on how to achieve this effect?

I also have a bunch of color blasts (probably around 40 ish) that are used as the backdrop of the stage which I'd like to have all the units strobe randomly at different times...again I'm not sure which effect do I select and how do I set it up on the console to achieve this effect.

Any advice would be really appreciated!!
Related