You may have been bundled the SoundDiver OEM CD with your Virus Rack - if so this should cover your patching and librarian needs including importing, uploading, saving and re-organising patches, as well as sound designing (manipulating parameters etc). If you weren't given it I'd be happy to upload it for you.
As mentioned you will need some sort of MIDI interface to connect your PC to VirusRack to use it. Probably the cheapest USB-to-MIDI interface is the '
Roland UM-One' which has 1x MIDI in/out. But I'd go with at least a 2x MIDI in/out interface, such as the '
Edirol UM-2G' or similar as you may wish to use it with your Motif or another unit at some point. I have the
Edirol UM-3EX (same as 2G but has 3x MIDI in/out) and it works a charm.
PS. Edirol is Roland. They're currently transitioning all the former Edirol labels to Roland, so the name Edirol/Roland is interchangable even though the products remain identical.
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PS > And another thing! Will the Ti|3 have user customisable/importable wavetables?

A ribbon-controller or XY-Pad might be nice, too, please! Thanks!