With the Virus it is pretty easy to program analog sounding patches in a short time due to its excellent filter and basic sound character.
Thanks to Ben Crosland and Howard Scarr, 2 excellent sound programmers (many of their creations can be found in the factory presets).
Their finished patches arrived in my mailbox a few seconds after they had listened to the original sound; when I myself was still searching for the 2nd Virus osc ;-)