Question about Mobius and Surround Sound

[kkissinger@kevinkissinger.com]

Perhaps someone can answer my question...

I am running Mobius as a VST plugin under Cubase SX3.

I would like to assign tracks to different VST "ports", so that I can  
utilize Surround sound.  It appears, though, that no matter how I set  
up the VST ports, that the only signal path is channels 1 and 2 (that  
is, the front channels).

Is this a limitation with Cubase SX3?   Would an upgrade to Cubase 4  
solve this?

Thank you for any advice on this topic.

-- Kevin