I no longer have the link, but the guy who was testing it was something I clipped out and put into my notes. I may have edited it for length a tad, but the player said
This thing won't. Stop. Proccing. Seeing a proc rate of 2-2.5 PPM. Seems to check Gaussian once per 10 seconds per target you are buffing. Not work for [your mastermind's] pets, but this is still huge, especially if on a full team, league with other MMs with pets you’re buffing too.
That doesn't sound too awful or too random. I mean, maybe not quite as on-demand as "I click a button" either I guess. Maybe I read too much into that without understanding how reliably it would proc elsewhere.