I have installed 64 bit sonar x2 on 64 bit win 7 system
and i will start a session from x1 with Pentagon in use, 
but x2 cant find the Synth


does somone knows what i have to do if i want Pentagon in X2 63 bit?

If you run X2 "as administrator" that should allow it to find and use Pentagon I

For all your, must run as admin issues. Advice from someone who has been around windoze a LONG time, disable UAC always use your main log in, if you are the only person using your PC. I see SOOO many people with this issue. If you are behind a firewall, and you keep your AVG (only antivirus to use IMHO) up to date, you'll be smiling ever after. No need to respond to UAC, no need to disable your anti-virus on installs.

My .02 for what it's worth :).

You're suggestion to disable UAC shows your lack of understanding of defense-in-depth and you're willingness to open up your system to attack out of convenience.
 
A better and more secure method to launch Sonar (or any application  for that matter) with elevated privileges (admin mode) is to:
 
1. Right click the Sonar shortcut.
2. From the Shortcut tab, click the Advanced button.
3. Check the "Run as administrator" box.
4. Click OK to close the dialog boxes.
 
Should take 5 seconds to perform those steps.
 
The next time you launch Sonar, a prompt will appear requesting elevation - that's not hard or inconvenient.
 
The real problem is that there are some plug-ins that were poorly written to require elevated privileges. Why would ANY pro audio anything need elevated privileges to run under Windows? Lazy/unskilled/clueless programmer(s). This is not Cakewalks fault. Pentagon I is the culprit in this case.