Hi Tomer,
Do you mean modular as in those bookcase-sized mammoth hardware synthesisers, which require patch-cords etc. ?
http://www.synthmuseum.com/ems/emssynthi100bro.jpg (and bigger)...
Or do you mean in the construction of the software operating-system? As far as I know, the Virus (and all modern VAs) use a kind of digital 'modular' system, whereby you can patch in LFOs, EGs, Oscillators, Filters, etc...
?