Hood wrote me a Brain and a macro to automatically select pulleys . I am about 2 weeks ago from setting up my machine and trying it out. I have a Bridgeport mill with a backgear and VFD. the back gear has a prox switch made when in high and off when in Lo. basically the macro gets the S command and figures out which pulley to use and pops up a message for me to change gears, when the prox is in the right state I can press OK and the program continues. I'll let you know how it works and post it on the forum if successfull.