Stuttering is covered in many other threads already. Raise your output latency to 50, and spend some time reading about computer performance related to audio production.
Legacy Forum Post
about 12 years ago
If you haven't already, be sure to check out the [b]ReadMe[/b] that came with your Sibelius/VDL template. You'll see all the various noteheads and staff placements for the various syllables for drum major vocals in there. Also lots of super helpful information about using VDL with Sibelius throughout that document.