As I mentioned earlier, I was not particularly fast, but my slider was actually my fastest pitch, topping out at 86, and I could change up on it by relaxing my grip which brought it down to 79. I had a four-seam fastball at 82, and my other stuff varied from 69 to about 80---I was surprised to find that I was faster than I thought I had been. I used the same grip for that pitch that Ed Lopat did---index and middle finger very close together, middle finger just touching one seam, fourth and fifth fingers sort of curled up on one side of the ball, thumb underneath and sort of splitting the ball in half---a standard slider grip, in fact, and I was thoroughly comfortable with it. My other pitches? I didn't pay much attention to how I was gripping the ball, except for my favorite changeup---the palmball, often referred to as the "Bugs Bunny" change, and very effective it was too. I could vary the speed on that one.
As for the crossfire---I worked fast, and I used a slide-step all the time, so when I wanted to crossfire one or another of my pitches I just moved. Full windup or stretch, made no difference; I just moved fast, took that step toward third base, whipped around and threw from that angle---and the batters were caught off balance all the time! You might call it dramatic---I called it a crossfire. I had picked it up when I was about 12, and I fell so in love with that delivery that I ended up using it all the time. Lopat checked me out on it, noticed at once that I wasn't getting quite the
momentum going into it from the stretch that I was from the full windup, and he worked with me to get it up to the speed I wanted. (I had the nickname "The Exterminator" pinned on me as a result.)
Any more questions, feel free to ask---I'm no farther away than my stupid computer.