From the Sonar support site
Cakewalk support page (Click Link)
"
What if my favorite plug-in maker doesn't make 64-bit plug-ins? This is where SONAR's BitBridge™ comes in. BitBridge enables the use of 32-bit VST effects and instruments in SONAR's 64-bit environment. BitBridge technology extends the viability and use of your favorite VST plug-ins; ensures future compatibility of freeware, even for the most obscure, independently developed shareware plug-ins.
In some cases installing the 32bit version of SONAR on your 64bit OS is necessary. Install the 32-bit version of SONAR by reinserting your SONAR installation disc and choosing the 32-bit option during the installation. This version can run along side the 64 bit version of SONAR so you can use it when you need to work with 32 bit plugins.
Note - SONAR was made jBridge compatible so customers could have a second option to BitBridge if needed. The free
jBridge download does work as a good test to see if its performance is better than BitBridge with specific plug-ins."
Peace