I added valcanos in a mod using MW. When I go into the mod to play I can hear them shooting the lavarocks but don't see them

You need to set targets for the volcano.

Go into your mission file that you are modding and find any object that you want your volcano to target.

New TSStatic(target1 ) { <---------------------------------------put target 1-5 on an object here.
position = "-92.1398 -89.7252 115.367";
rotation = "1 0 0 0";
scale = "1 1 1";
shapeName = "~/data/shapes/Red/rockred01.dts";
treeLighting = "0";
lightBoost = "0";
};

You can have the volcano target up to 5 objects. (Unless you add more to the datablock in Special.cs.)

Hopefully that helps. :)

Thanks Paco it works now