Thanks. I like the 2 seamer that has no difference in either velocity or break from the 4 seamer.
those are differentiated more based off of spin direction and magnitude. Essentially, they are the same pitch, but the two seamer has a bit more magnitude in its spin and a bit more horizontal movement. PitchFX doesn't always get them right, but after looking at them in depth for almost a year now, it does appear that it's get it right more often than not. There is one that is improperly classified as a two seamer, the other two are correct, though.
(the two blue dots b/w 210 degrees and 225 degrees are two seamers based of their direction, magnitude, and horizontal movement. You can also notice the one green dot improperly classified as a fastball. This happens sometimes when their is conflicting readings on a ball (more rotation than usual, or more speed/angle than the normal pitch), but gets normalized after a few outings.)