Timing and Velocity are in the Random box. So it just randomizing the hits a little to make them feel more natural.I'm not sure if it's a true random, as you can see the pattern change in AD2, and it always seems the same. If you set it to a two bar pattern, bar one gets affected the same way as when you set to a one bar pattern. I can't make out the logic of the random function. I add a touch and if I like it I keep it, if I don't, I don't.
Swing is usually positive and negative option.