I was thinking about a magus with Performance Magic in Brawl, and the option of multi-casting an offensive spell at Touch Range, for example a PeCo that causes a Light Wound at Touch Range.
In this case how many attack rolls the character must do? One for all the spells, or one for each copy of the spell?
(Represses images of an AM version of a Thriller dance fighting scene)
I would say that if you intend to cast all at one target, one attack would suffice. If multiple targets, then one/each - and possibly with additional restrictions/penalties, as SG/Troupe determine is appropriate.