I made a custom horn patch, years ago for when I played Chicago songs. It was a simple, two part sound, made up of a strong, articulate tenor sax and a big, fat trumpet sound. They were panned hard left and hard right, and the effect was just what I needed for playing live horn lines that didn't sound "Farfisa-ish".
I've found that the more sounds you layer together, the closer it sounds like an organ, so I try to keep it simple, whenever possible.
Don't use brass "sections" ... use a single trumpet sound. Add some light chorus if you need to thicken it up a bit.
Good luck !
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