Dear Syntax,
However, your comment about replacing the Raven controller with the VPI SDS was ill-advised. I am not familiar with any of the Raven turntables, but someone on the other newer "motor controller" thread has remarked that the Raven motor is DC, whereas the VPI unit is designed to run AC synchronous motors. So, to the OP, don't do that swap. It is always best to use a motor controller that you know was designed specifically for your turntable motor, for good or ill.
However, your comment about replacing the Raven controller with the VPI SDS was ill-advised. I am not familiar with any of the Raven turntables, but someone on the other newer "motor controller" thread has remarked that the Raven motor is DC, whereas the VPI unit is designed to run AC synchronous motors. So, to the OP, don't do that swap. It is always best to use a motor controller that you know was designed specifically for your turntable motor, for good or ill.