I started to respond...and then I confused myself, so I'm starting again.
I think the reason why I confused myself is because "Anima Spiritia" is clearly, as you say, an ability. And yet, the Protodeviln say that Basara IS Anima Spirita, not that Basara HAS Anima Spirita. In any case, Anima Spirita is the bane of the Protodeviln, not the Vajra. So some form of Song Energy may be part of the MF story, but I doubt Anima Spirita will.
And yes, if Sheryl goes out there in a VF with sound boosters, I'll be pretty annoyed, too. But not as annoyed as I'll be if the Vajra start shouting "The Beauty of Annihilation!" as they attack the ship.