I know that TurboCnc is being outfitted to handle the DigiSpeed control and would think following this procedure should allow another controller.

I have not yet gotten into the programming necessary, but it should be "simple" to configure that programming to accept other controllers.

From memory, there are three pins need for this controller.

I look forward to seeing this thread continue as I have a VFD on my mill that will accept either a 0-5 or 0-10V analogue input to control the speed..