HI ..welcome to the fORUM
TRY to read the documentation that came with your virus and use search on the forum..it has probably been covered many times...
it will require you to use 16 midi out channels, set the port number on the virus the same as the midi channels in logic..set the channels from 1-16...
next you will want to know how to route each channel to seperate mixer tracks...for that you need to setup the usb outputs on the virus...
try searching..i'm sure u will find this information in a more detailed manner somewhere on the forum through search...and the pdf/ help files that come with the virus will have a tutorial on how to set it up...
good luck
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