you need to dig out the old installers to get the vs-700 working for Sonar Platinum ... once you have it installed, it will work just like with X3 ...
hoping for more than that is wishful thinking because everytime a thread like this pops up, the conclusion will be that Cakewalk is no longer part of Roland and hence nothing can be done ...
nevertheless i vote for this request because i consider control surface support as a must ...