Ahhh, I didn't see the Motion mode check box, only the CV control check box.
Thanks for your help
I see the G61/G64 code in the Code line. New G codes load/unloads in this line only at start up of Mach3 it looks like. Don't know yet if this line updates as a G-code file is loaded.
I played around with a "square pocketing file". Zoomed in in the toolpath window. Fascinating to see the effect on changes in the CV Distance and CV Feedrate settings.
As I understand it the CV Distance is the maximum distance from a corner where the deviation from the original toolpath is allowed to start. The CV Feedrate seems to be the maximum feedrate in "corner cutting mode". A low value here makes a sharper corner with less deviation from the original toolpath. A zero value here should make the CV mode the same as the exact stop mode where the feed rate is zero a very short moment.