This is just an internet forum so I have to make a couple of assumptions, forgive me if I'm way off base.

You're unhappy because the Biab tracks don't sound like Garritan's demo's. Biab is a GM based program. GM is very limited when it comes to midi controls. If you want your midi sax track to sound as good as the demo you need something like this:

http://www.musiciansfriend.com/keyboards-midi/yamaha-wx5-midi-wind-controller?src=3WWRWXGP

This is a sax based midi controller and of course it's designed for sax players. If you're not a sax player then you would use something like this:

http://www.zzounds.com/item--NOVZEROSLMK2

Notice these things are not cheap. If you want to take advantage of expensive software then you also need a good controller and the time to learn a whole new instrument. You have to learn how to turn a knob, pull a slider or apply aftertouch or a filter to a sax sample while it's playing to give it the articulation necessary for it to sound real. The reason these sample libraries are that expensive is because they're capable of responding to controller input. But, they're not GM each one uses their own proprietary way of working with a controller and it's complex and difficult to master. Biab and GM are not capable of controlling something like Garritan or or other high end horn sample instrument sets properly. All Biab will do is sound the note at the proper velocity and apply some reverb, chorus or vibrato, that's about it so yeah, the best sample in the world will still sound fake. It takes you, a musician using a good controller to fix it.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.