Control (Spell Modifiers) can control a specific spell up to 10 times level squared points, adding or removing 10% worth of modifiers per level.

Control (Spell Modifiers, Occasional) 5 [120] 
    Persistent [+40%] 
    Extended Duration (Permanent) [+150%] 
        Applies to Persistent 
    Extended Duration (x3) [+20%] 
        Applies to how long the caster has the ability 
    Reduced Time 1 [+20%] 
        Free action to affect spells, but doesn't apply to casting time 
    Only to Increase Existing Area Effect [-80%] 
        Can add Area Effect to Advantages with a built-in Area Effect 
    Can Only Affect the Caster's Spells as They're Cast [-50%] 
    Magical [-10%] 
    Spell Components [-30%] 
        Must say "area" in Latin 
        Must gesture with hands 
        Must hold two different sized balls ($3 each) 
Levels 2+ [+24/level] 
    Increase Control by 1 level [+15 base]