Hey!... I got it working.. but WTF!!!
As previously mentioned, if I create a new X3 project, it all works perfectly, yet I notice that a weird sort of hybrid Midi/Audio track is created, (see pic below).
I then exported this as a Track Template, and then imported it into my project that wouldn't function properly.
And with no additional steps, the Waves Tune plugin commenced scanning my vocal track and all is sweet.
So what is this "Waves ReWire" track, which has possibilities of selecting Midi properties, yet has has a reference to the Master Audio track as part of it's properties. Huh?!?!?!?!?!?!?!?
Thanks