Access VIRUS|POWERCORE User's Reference Manual page 14

STEP5: Select "Virus PowerCore" from the
"out" menu in the track inspector to route the
MIDI output of the track to the Virus Power-
Core.
STEP6: Select MIDI channel "1" from the
"chn" menu in the track inspector to play Part
1 of the Virus PowerCore.
Now you can play the Virus Powercore via
MIDI and record on the created MIDI track.
You can create further MIDI tracks and assign
them to any of the four Parts of the Virus by
selecting the respective MIDI channel from the
"chn" menu.
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