Hello, till now I pitched mostly 4-seams and sometimes cutters or 2-seams (moving fastballs), I don't have many strike outs, because I usually jam them. So to complete my pitching style, I decided to try changeups (batters usually try to hit the ball before it moves, it would be good to mess with their timing). But there aren't many guides to changeups up in the Internet and little to no information about their movement. It would really help me, if you write down (not reccomend) all kinds of changeups, their movements and grips. I heard that vulcan changeup has some kind of knuckle effect, is it really true? Sorry for my bad English ;D.
PS: for example : circle change - moves away from your glove hand
straight change - moves like a 4-seam, but slower