Typically VST paths are set to a couple of places by default in SONAR on first startup. You can customize these paths and tell SONAR to look in different places on your computer by following these steps:
To manually add this/these plugin’s file path to SONAR X2:
Navigate to Utilities|Cakewalk Plug-in Manager
Highlight the [name of plugin] category in the Plug-in Categories column.
Do your plugins show up here? If not,
Select [Options]
Within the next window select [Add...]
Browse to the folder location of the plugin on your computer.
***If you cannot find the plugins on your computer under the name of the plugin, then please try looking for a folder named after the manufacturer (in your case, Toontrack for EZDrummer, and IK Multimedia for Amplitube) of the plugin***
I would suggest looking in Program Files and Program Files (x86) firstHighlight the folder containing the .dll plugin file and select [Ok] and then [Ok] again.
Lastly, select Scan VST Plug-ins
Hopefully this helps!
-DG