FLStudio's plugin manager is not up to date with the latest versions of the SDK.
This was taken from the page "VST 3 Locations / Format" in the SDK documentation:
[quote]
On the Windows platform a VST 3 Plug ...
I have some drum machine kits loaded in Directwave and I am wondering if there is a way to get per-note multiple outputs. For example, C3 goes to output 1, while A4 goes to output 2. ...