Simple question: How do I create a Sforzando in, say, a Brass Instrument track?

It depends on your sample library. If it’s a good one, it comes with sforzando samples and all you need to do is trigger them via controller of your choice (mod wheel, exp pedal etc.) If, however, your sample library does not include sforzandos, then you’d have to somehow simulate them with velocity and an envelope generator.

Thank you very much!