If anyone knows the inner workings of Mach3 well enough to shine some light on this seemingly easy task I'd be much appreciative. I made a simple prober that lights up an indicator on the Mach3 screen, however, I'm wondering if there's a way to trigger a beep as well.

mach3 can Speak,  Play a wave file(sound) or signal a Beep.

It is covered in the manuals "somewhere" (;-)

(;-) TP