Halo!
choose Powercore Virus Multi out
goes to vst instrument properties - setup routing-activate all bus to tracks from 01 to 04
but sounding only bus 01 on track 01
what is problem?
When quickly reading the manual, it looks like the virus has assigned a midi channel to each audio out.
This means in that case that you have to change the MIDI channel to use the other output, which means that you need three other Aliasses of the VSTI and then assign a different MIDI channel to each alias.
See the Alias part of the manual:
http://tutorials.renoise.com/Renoise/UsingVST#alias
Thank U 