A breath controller works very different then a slider. Ofcourse they both send CC out, but when simulating a windinstrument its feels much more natural then a slider. You also have to use more then one controller for example, 1 slider, breathcontroller, aftertouch, modulationwheen pitchbend and CVpedal
Its great to link the breathcontroller to
1 volume
2 pitchbend
3 filtercutoff
4 filter (over)drive
all at the same time!
You have to tweak a lot (only a bit of volume and picth modulation, some more for the cutoff and drive etc just experiment) but then you can really modulate the sound intuitif. Add aftertouch for vibrato (lfo speed) and modulation wheel for vibrato depth (lfo depth) and you have a lot of possibilities and combinations.
To downside is that you have to spend time to master your new instrument (like a real acoustic instrument) to play it. Meaning practicing a lot. Its quite different then just playing the notes of a melody. Ofcourse you can (I do sometimes) multitrack the controllers, this can make it easier.
Ofcourse its not only for windsimulation, your synthsolos/lines will get much more impact when you modulate them the same way.
By the way, listen to pieces of great theremin players. They have great expression and feel in their playing. But the sound source is basicly a sinus with pitchmodulation and ampmodulation. Its the human's hands (and lips and breath) that makes the feel and put more emotion in music. It takes time to learn but...
Just try it
Jerome