Studio One 5.2 and later supports the new Sound Variation API freely available to all plug-in and host developers.
The new Sound Variation API provides a way for the host to discover variations (articulations, playing techniques, etc.) supported by the preset currently loaded in a virtual instrument plug-in. This enables tight integration between the DAW and complex orchestral sound libraries. The new API is supported by Vienna Symphonic Library's Synchron Player.
Detailed technical information can be found in the Developer section as part of the PreSonus Plug-in Extensions.