Good musicians, under the direction of a good baton, drop most tied notes and shorten many others. The problem is a real horn will vibrate and decay and many players learn to count and think that 2 is always 2. It's not, if you want ...separation. Midi can have zero decay, and thus there is sonic space. That's ok if you have a band and you are able to creatively account for that.

Two of the three leaders I play horn with are very cognizant of stuff like decay, and you typically get a chart that's all marked up. I find that part most interesting.

I have not messed about with realtracks in this context. I just use my 'ears' to figure out what I want, and if the tracks meet that expectation.

John Conley
Musica est vita