Aran splash damage?

It seems like only double/triple swing are affected, while combo smash hits the same damage regardless of the number of monsters. Is this true? What other skills are affected/unaffected?

And what is the formula?

Thanks.

http://www.southperry.net/forums/showthread.php?t=15602
^ Talks about splash damage.

Combo Smash does not splash. It hits 700%(w/ maxed) all the time. Triple, double, and normal attacks are all splash.