Incidentally, there is an excellent app called jm2cv that does a good
job of "converting" cv data to jackmidi (and vice versa) written by
Peter Nelson. (See the non-mixer webpage for details)
So if your particular app of choice has midi out for automation, you
can direct it to a CV in port for, as an example, fader control in
non-mixer.
Just start jm2cv, and ports in and out of it in your favourite patchbay.
Simple stuff.