Elektron Overbridge

I'm trying to use Overbridge in Sonar X3, Overbridge controls the hardware drum machine from a vst and creates multiple track outputs for the audio coming from the drum machine through a usb connection.  The problem I'm having is that when I add a track input from the drum machine Sonar converts the audio track to a split instrument track which cannot record the audio (it can have separate track fx and sends and so on but the vst and it's split instrument tracks only record midi information on the master vst track).  Any suggestions?