Upgrading my TI?

[EoN]

Hey guys,

Got a question regarding upgrading my TI software. I have a TI Desktop, currently with OS version 2.5.1.02 (12-Sep-07). I use Steinberg Cubase SX3 on Windows XP. It is reasonably stable atm, I'm using it integrated, mostly with the sounds using the USB1 & USB2 Outputs. I'm working on an important project atm and have a lot of tracks I'm still working with that use the TI, so I'm concerned about installing an upgrade. I have a few quick questions:
- If you upgrade to the latest OS, will tracks that were written using the older version still work seamlessly when opened? Will all the samples/patches still be assigned, using the same outputs, etc?
- I noticed on the site There's either BETA Version OS 4.0.2.01 or RELEASE Version OS 3.3.5.02. Which one would users recommend? What are the main differences here?
- Does either of these upgrades include more USB outs? That's the main feature I'm after really. I think I once heard talk of it being increased to 3 or 4 USB outputs instead of the 2 I have, but I'm not sure if that happened.
- Any patches I've installed on the Virus, will they still remain after an upgrade?

Hoping to do this upgrade ASAP so would very much appreciate any answers or help!

Cheers,
EoN

[PaPi]

V. 4 is pretty stable and it offers a lot more goodies than v. 3. Works like a charm with Cubase 5 x64 and Win 7 x64, but I don't know about Cubase 3 SX and XP. Worth a try though. Worst than can happen is you uninstalling it and going back to v. 3.