Ya I understand how that works, but the guy doing it all on the laptop was actually able to bring up the position they broke from, as it was different for some, and actually manipulate it over the center spot to get a corrected reading as if that's where they broke from. It was interesting to watch the initial speed based on the sound, and then when he he would grab their cueball from the position they actually broke from to the center, he got a corrected speed reading that they actually used. At least that's what I think I saw. I do know that I saw two speeds come up, one for the two hits sound, and one corrected. Shaw was pretty impressive, although the better breakers don't seem to be concerned so much as to max speed.