I just upgraded StudioOne to v4 today. Be aware that neither Synchron Pianos nor Synchron Player pass the plug-in validation phase on macOS running Sierra. Digital Performer is fine with both.
Not sure whether these passed in StudioOne v3, as my copy (even after many re-installs) failed to launch for over half a year. I also haven't tried it yet in Cubase, but I'm one ".5" version behind on that product. I'll try Logic Pro later on.
My only complaint about the new players is that they don't have standalone versions -- a trend in the industry. I like using standalone apps to ferret out problems and to avoid the overhead of launching a DAW session to insert a VI temporarily just for testing purposes. It's a much more restrictive an d time-consuming workflow -- especially if just using a VI for practicing parts.