Velocity control of dynamics with Brass sustain

Dear all,
I am setting up a new project where I intend to use Ionica Ensembles for strings and brass. I found out that for the sustain articulation of the Brass articulation the velocity control of the dynamics does not work. Actually if I set it to velocity control it still responses to the modwheel/CC1. Is there a way to change this behaviour,
cheers,
Joop