Virus TI in a live enviroment?

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Hi All! I'm a new user of infekted.org. I hope you can help me..

I am an happy owner of a Virus C Desktop. I use Virus C live, and I'm satisfied of my synth, but now I'm really interested about the Virus TI features, especially soundcard capability. So, before sell my Virus C and buy a new Virus TI, I want to know if with the Virus TI it's possible to do what I do with a sound card, a Virus C and a little mixer. I Have 3 questions:

1)
I need to:

use computer main out through the Virus and redirect to the main audio output 1/2
PLUS
use an external device through the Virus audio input and redirect to the main audio output 1/2
PLUS
use at least 4 mono (or 2 stereo) part of the Virus through the main audio output 1/2
AT THE SAME TIME!

Pratically, in a live enviroment I need to use, at the same time, the computer audio out, my drummachine connected to the audio input and 4 virus part, using the virus main audio output. Is it possible?

2)
Also, I need to know if I can filter and/or effect the sound from audio input and from computer with the Virus filter and the virus effects. Is it possible?

3)
The vocoder is still present?

So, what do you suggest? I change my Virus C for a Virus TI or I keep my Virus C? I have a MacBook, with Intel CPU and 1GB of RAM, and I use Cubase SX3 and Live 5)


Thanks in advance, you all are great!!!