Hi Wes709,
The M3 / M4 commands are far too slow acting so the M10Px / M11Px commands were included within Mach3 (and the M63Px / M62Px within Mach4) specially for laser use.
This thread describes my exploits and may be of interest to you;
http://www.machsupport.com/forum/index.php/topic,12444.msg248511.html#msg248511Although I have used Mach3 for laser reproducing photographic images for many years now, for me, the relatively new software Auggie seems to have taken over.
Tweakie.