Hi Jay!
The Special Edition sound set is designed to go with the matrices (not the presets) that come with it.
When using more instances of Vienna Ensemble, don't forget to set channels and programs for all instances on the Manual Sound Sets page. You can switch between the instances in the "Device:" line on that page.
Our legato patches are monophonic. So if you write a slur (which triggers the legato patch), you are are indeed limited to one voice. The other patches are polyphonic. If you want to notate more voices in one staff with a slur, you can exclude the slur from playback and thus avoid switching to legato. To do so, select the slur and go to the Properties windows/Playback. Uncheck the boxes for play on pass 1-8.
Best,
Andi
Vienna Symphonic Library