First I bring the Vel Xfade fader all the way down and right click on it and breath into the BC3,
now its assigned.
Next, I bring the Exp fader all the way down and do the same thing.
Now they are both assigned to the BC3.
You have to do it one at a time.
The VI does not cancel the assignment if the same
controller is assigned to 2 or more parameters.
DM