A bit OT but question for Carnwenhan owners.
Yesterday I met a guy who claimed the increased duration worked on Debuffs too.
He didn't really provide extensive data or tests, just that his lullabies on Tenzen were lasting more than without the dagger, hinting that it does have an effect on debuffs.
Is this true? The only test I remember concerning "increased song duration" stats were on AF3+2 body and Neck, during abyssea days, and those tests showed no influence of that stat on debuffs.
So my question is: Is Carnwenhan an exception to this rule? Were those tests during Abyssea era wrong and this stat always affects debuffs? The guy who claimed this thing was wrong and it doesn't affect debuffs at all?