I am thinking of adding laser engraving capabilities to my OX CNC. I just want to engrave wood (for now) I am looking at the laser engravers on ebay. How is the laser configured to use VCarve Pro and Mach3 to turn on and off? I also need to know what post processor to use. I'm using a Gecko G540 -4 stepper driver to drive my motors. http://www.cncrouterparts.com/gecko-g540-4-axis-stepper-driver-p-40.html) Thanks for any help you can give me.