Just recently started to get addicted to laser engraving, I have a 6w laser diode from opt lasers.com that I've hooked up to my 1325 CNC took me awhile but eventually sussed everything out running smoothly now, except for one thing that has driven me nutz to point I want to take a hammer to my computer, I use mach3 to to run my machine and pwm to control laser power with obviously spindle speed S command and m7\m9 for on and off, does any one know why evrytime mach3 hits the S# command it jogs? Only for this evrythink else runs smoothly. Any help would be much appreciated.