First of all make sure the Virus is syncing to the midi clock comming from Cubase.
You have to remember that when you record an arp in Cubase, you aren't actually recording each note of the arp, you are recording the first note to trigger the arp (unless of course you set things up to record each note - which I never do, so don't ask me how).
Once you have the single note recorded in Cubase, you can use the tempo of cubase to change the speed of the arp in your virus (as long as the virsu is syncing to midi clock from cubase OK).
Hope you have understood all this.
Good luck and let me know if it helped.
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