When you enter PCI soundcard territory it means you have moved passed DOS gaming and windows games of the era use digital audio in music (or CDDA) . The Creative series install a software synth with their drivers, similar to the Microsoft GS one that comes with windows. They are pretty basic and a hit-and-miss 50% of the time IMHO, one can install way better software synths , Phil's Computer Lab made a great video about it.
So it's no surprise noone cared to record some live!/audigy midi playback , it's kinda basic and nothing special. You can get a taste with the Microsoft one.
Now when it comes to either using the default synths or S2, personally I'd pick S2. But keep in mind these midi devices shine on older DOS games.