Use Manual PDC ...Make a channel , route all tracks through it by right clicking and clicking create sub mix to master...put virus on different channel which is not routed through sub group but to master directly...on subgroup channel go to bottom right corner, select track latency set from virus channel.
Also leave about a Bar at the beginning of the playlist arrangement Blank for the virus to do its thing (sync)...put no patterns there...start the whole arrangement 1 bar from the 1'st bar...basically start the song from the second bar onwards..
do not quickly start-stop repeatedly...this throws the virus out of sync.....
http://forum.image-line.com/viewtopic.php?p=742961