Nor upset just pointing out your reply. Actually you can use the Avid Mach4 PP in the Vectric software as I've built many Avid systems and no problem whatsoever. I've got 3 machines running the Mach2/3 PP with the systems dialed in to .0001. And yes, I use all of the Vectric Software, and have been for 10 yrs. And while Mach3 is not supported any longer I have run it on a Chinese 1325 with no problems. So as I stated earlier what one uses is dependant upon what control software is running the machine, or pendant system. I'm on a multitude of CNC forums and you'd be surprised the number of people that don't know which PP to use since very few take time to read their manuals.