V-Studio 20 with Cakewalk software other than Guitar Tracks 4.0

I've had my V-studio 20 a while now .......and rate it highly..Love the physical controls and the fact that I can call up effects and tuning etc ..............via th V-studio .......Obviously it works a charm with the supplied Guitar Tracks 4.0
 
I've recently bought Cake walk Sonar Home Studio 7.0 
 
and am having problems in getting the V-studio to act as the controller ,....., with all functions/ buttons working via the V-studio .and , if necessary also via the screen.
 
At the moment I can get the whole thing to work by
a)By telling each track in the song .to use the V-studio and input and output ......and also by telling the software to use the V-studio as input and output via the Options >......>> Audio Function .
 
b) By using the software as the Controller .ie Arming tracks etc
 
the V-Studio act as as an interface .......So my software recognises it .........................But the V-S-20 Controls dont work...... so it doess not regognise it fully ..some link appears missing ??????
 
What do I need to do so the V-studio 20 becomes the controller ( as it should be  ) for transport / track arming and V-Studio Effects ???
 
also .........Is there  any way of telling the HS7 software to use the V-Studio as the default input and output device ...and not have to do it track by track
 
 
Any help appreciated ./......................love the kit ....................just want to use it fully
 
Thanks in advance
 
Stummer07