FAQ SECTION, PinballX documentation PDF page 5-17. There is also a YouTube video out there somewhere. Docs are old but should work. I need to do the same.
Actually it does not work, and it is because of the incompatibility of 32bit and 64bit programs and plugins. DOF could be compiled 64bit but then VP and B2S will stop working when operating in 32bit mode. I suggest to install PinballX forced 32bit when using DOF or B2S plugin, unfortunately all 64bit advantages get lost then!