SSL plugins are compatible with Studio One.
If you are not finding your SSL Native plugins in Studio One, please see Studio One's guides and followup with PreSonus regarding their methods of utilizing folder locations, scanning, and blacklisting:
- How can I get my 3rd-party plug-ins to show up in Studio One?
- What is the difference between "skip" and "disable" in the new plug-in scan, and how do I manage plug-ins now?
- Studio One does not recognize new plugins
You may also need to simply run as administrator or reinstall Studio One.
Additionally, the issue below was resolved in SSL Native 6.1 and is kept here for posterity:
On macOS if SSL Native VST3 plug-ins do not load correctly in Studio One, please delete the VST3 files from your computer and use Audio Unit (AU) plugins instead.