
Finoan |

I'm not finding anything like that for Fortissimo.
What you are describing sounds a lot like Martial Performance that extends several other Bard Composition spells by one round when they damage an enemy with a Strike action. Warrior Bard as initial base class Muse gets that automatically.

Finoan |
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Yes. The Spellshape change from Fortissimo would last for the duration of the spell.
Normally that would only be the one round, but extending the duration using Martial Performance would extend the existing spell and all of its current stats.
Do note that you can't extend the spell more than once using Martial Performance. You have to re-cast it on the 3rd round. And would have to spend another focus point on Fortissimo if you want that benefit again.