Hi...
 
Ifg I upgrade to Splat from X3 is there anything different  or additional in the AD2 packs (number of packs etc)?

Congrats!!
You should be able to get 3 adpacks, 3 midi packs, and 3 kit pieces (check in your CCC for the serials to register at XLN). This alone made it an offer I couldn't refuse (same upgrade path as you).
 
As far as different from X3, man there's a ton of stuff that happened within the last 8 months which improved Sonar greatly......I don't even know where to start. I installed everything in the monthly updates, but haven't had time to check out most of them. I think you'll be very happy with Splat.     

So do I register using my existing xln account?

Elffin
So do I register using my existing xln account?

Yes...just use the serial # that will be in the Command Center
next to the product and register. You'll be prompted to pick
what you want.  Command Center will install
AD and the XLN Online Installer, which will install your kits and
things.   

I used my existing account to redeem the voucher. Instructions are here http://www.cakewalk.com/S...tallation-Instructions

Again - thanks guys!