Nothing? I tried with different brass voices but don't seem to be many realistic...:(

Perhaps the reason for no response is your demand for better realistic brass... short of sending you an acoustic horn section, no one can satisfy this requirement. It really is the worst way to request anything. At best, someone can direct you some sounds that they have used successfully, to which you may simply reply "not realistic enough"... this is the Internet, that's the kind of thing that happens...

In fact, the amount of realism actually comes from *how* the brass sound is played as much as it does the sounds themselves. Recreating a salsa feel for a horn section has as much to do with the idiomatic phrases that would define that musical genre, as it does the brass sound itself.

I've had great success in building specific horn sections when having to recreate a Latin horn section. Example, multiple Parts - multiple tracks...
Part = trumpet
Part = trumpet (oct higher)
Part = Alto sax
Part = Tenor sax
Part = trombone

Depending on the Song, I might do a section of 4 Alto saxes (merengue) to do call and response lines with a section of brass.
Don't always look for the solution in one sound. If you've ever written individual charts for a horn section, do so here... build your horn section a line at a time, one horn at a time. Not only will the result be more satisfying, when you finally play it all back, but by writing out and then performing the horn lines individually, you'll wind up with a (dare I say it) better more 'realistic' horn section!

Just my suggestion...