There are 6 meters for surround in the insight UI, but only 2 seem to work at a time.  
Instead, sonar puts several "Tabs" across the top so you can choose C, LFE, or Ls Rs.
It seems you cannot view all these meters simultaneously even though they are right there.  They are inactive until you click the tab for the surround region you want.
 
Is anyone getting this to work in Sonar Platinum (or X3 for that matter)?