Virtual Percussion Dynamics

Hi there! I just paid for and downloaded the Virtual Percussion sounds. I’m absolutely in love with them, but I do have one issue: the snare/timpani/bass drum rolls don’t crescendo when they roll. I’ve notated a crescendo, but it just goes from suddenly soft to suddenly loud.

Additionally, the audio doesn’t seem to do accents or other forms of articulations. How do I fix this? Thanks in advance!