OK. So after 2 hours of reading what I was able to google, etc I am would like to ask the forum folks. In Vcarve Pro using a LEAD 1010 with BlackBox controller I have been using the G-Code MM (*.tap) PP. Is there an advantage to using the Grbl MM (*.gcode) PP? I have learned that the ATC ones are automatic tool changers (some day - price point is more than the machine). I have also learned (but am not 100% sure on) that the arcs processors are using G2 and G3 code for non-linear function cutting of arcs/circles. Non-arcs uses G1 code which on a hobby machine like a properly built and calibrated LEAD 1010 should show no difference in output product. G2 and G3 becomes important for 3 dimension objects such as spheres on a 5 axis machine. Is this spot on????? Thanks, Folks!