.Map :: MoHAA Mapping

I searched for something related to this, but couldn't find a straight answer.

When adding some explosion effects, I noticed there was different kinds of the same thing such as:

anitmate_fx
addon_fx
fx

These 3 categories (not sure if there is more) all contain some of the same thing. Advantages disadvantages?

The addon_fx are the SH fx'es. The animate_fx are stuff that fly out like the mortar dirt and stuff. fx are normal and simple, and only have some small explosions.

That's what I think, so anyone is welcomed to correct me.

well I used addon_fx for my map but its a MOH map? and works.