Studio One supports audio plug-ins in VST2, VST3 and Audio Unit format. These technologies are maintained by their respective owners and the appropriate SDKs are available separately. In addition to the basic plug-in API implementation Studio One supports host-specific extensions to the original SDKs.

• Support for Sound Variations (Studio One 5.2 and later)
• Support for Instrument Extensions (Studio One 5.2 and later)
• Query key switches from VST2 instrument plug-ins (Studio One 4.5 and later)
• Notifications for cloned plug-in instances in low-latency processing mode (Studio One 3.5.2 and later)
• Remote control channel volume, mute, solo, etc. from plug-in (Studio One 3.2.1 and later)
• Gain reduction reporting to the host application (Studio One 3 and later)
• High DPI scaling notifications for plug-in GUIs on Windows (Studio One 3 and later)
• Access context information like channel names, colors, etc. (Studio One 2.6 and later)
• Per-parameter commands for audio plug-ins related to automation and mapping to control surfaces
• Support for embedding plug-in views into the single-window environment of Studio One
• Support for sizable plug-in editors in VST2 using a similar mimic to VST3
• Support for direct plug-in view renderering to render targets (Studio One 6.5 and later)
• Support for native Wayland plug-in views (currently being implemented)

Feel free to integrate these enhancements in your plug-in or adapt them for your host.

PreSonus Plug-in Extensions Documentation

Technical Note on System DPI Scaling for Plug-ins in Studio One