You can often pick a "strings" pad and get away with it. Even "woodwind" will work.

But "brass"... Not so much. It'll work for fast stuff like stabs, but for anything that holds for a second or two will often sound synthetic and fake. Reverb can help a lot.

But you'll get better results if you can split the chord and assign it to individual instruments. A single "brass" pad won't do the trick.

Even then, if you listen to the JABB demos, you'll hear an emphasis on individual instruments, and not on groups. The sounds work as a pad, but JABB doesn't really have much in terms of dynamics. I think what you hear in the JABB demos are lots of different colors - switching between different instrument groups - rather than expressive dynamics.

There's a reason that good brass libraries cost money - there are a lot of articulations and expressiveness that needs to be captured. And it won't come free, once you get the library - you need to tweak each line to get things to work.

So the short answer is: I don't think you're going to find a single "patch" that will solve the problem.

-- David Cuny
My virtual singer development blog

Vocal control, you say. Never heard of it. Is that some kind of ProTools thing?