Making a Command cast a single spell

EDIT: @Everything, I think that the animation called for Control might be in the FF3USME Battle Editor (the one with Terra swinging a sword on the button).  That's where I found other command animations, like the one for Terra's Morph and the one for Possess.

Aha, you're right! Control is number 45 under "Animations 2".

Make sure to do all the other steps in C-Dude's tutorial except the last one. That's what changes the actual effect of the attack.