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) 1 [24] 
    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 
    Cosmetic Changes Only [-80%] 
       Can affect appearance, sound, smell, etc. 
       Nuisance Effects and +0% special effects, mostly 
       Low Signature and No Signature are also possible 
    Can Only Affect the Caster's Spells as They're Cast [-50%] 
    Magical [-10%] 
    Spell Components [-30%] 
        Must say "presentation" in Latin 
        Must gesture with hands 
        Must hold a multicolored ribbon with a bell on the end ($1) 
Levels 2+ [+24/level] 
    Increase Control by 1 level [+15 base]