In this video I show how to add per note expression to Geetar (Chet Singer) and NI Sparks, but the techniques are applicable to most polyphonic Reaktor ensembles.
and there are lots of those, so this opens up a rich selection of expressive synths for us to use with the Soundplane
FYI, after a request for the T3D macro, Ive added a newer version to the Reaktor User Library T3D OSC macro