The controller that you were sent should control a 4th axis, you may only need a stepper or servo driver to use the facility, check on the deskcnc board to see if you have an "A: step and direction, if so all you will need is a device to drive you motor. Let me know and I will try to help you out.
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(Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)