hi, still not heard from AA support, but believe i've fixed the problem even if it feels like a "bodge" fix!!
i uninstalled the ASIO drivers and also uninstalled all 5 VMS4 drivers (2x audio, 1x mouse, 1x usb input, 1x usb composite device) by going into "devices and printers" in control panel (not device manager!)
plugged VMS4 back in and it re-installed the drivers, but i did NOT install ASIO.
opened traktor and can now route my 2 decks to sound out 0, 1, 2 & 3
however, it's not working in VDJ yet - was asking for ASIO... might try installing ASIO again and see what happens