Thanks for the replies.
I finally got my TI2 Polar "Dark Star" this week and lovely it is too

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I now have it set up and running under Sonar 7 and it all seems to be working (which in a way is unnerving cos it can't be that easy right?). I'm still a little confused by the whole VST thing particularly when I add it to the synth rack. It's creates a track for the Virus and then I need a separate MIDI track for each part and then when I get around to recording the audio I will need an audio track for that - so what is the virus track for!?! - but not sure if I should go via USB or out via my MOTU (sorry lots of rhetorical questions there!!!). It's all rather confusing at the moment.
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Virus TI2 Polar "Dark Star", Yamaha EX5R, Yamaha SY77, Roland JP-8080, Roland SH-32, Roland D-550, MOTU 2408mk3, Sonar HS 7
http://www.d50librarian.co.uk - Librarian for the Roland D-50