Download mfxscript and wrapper for Cubase here
Here´s a site for you if you´re interested in getting your hands on the brilliant mfxscript that was put away from public, but is now available again:
And remember. There is no support!
(mbncp, the author, told me it´s ok to give it to others if I tell them that)
If you dont know what it is, mfxScript is a MIDI only plug (windows only) based on the Mfx SDK from Cakewalk (Sonar). To work in Cubase it needs the MfxWrapper (a VST-MA plug).