@boomerang,
Finally , a sensible subject.
My non-dominant left snaps with a sharp sound and the dominant right snaps with a flat sound (so I'm ambidextrously incapable of carrying a tune).
The flatter sound on the dominant hand (they are both philosophically existential and the right hand wrote no religion in the last census it literally completed) is probably due to my middle digit hitting a less elastic lump of meat.
When I say probably I don't mean the combinatorics inherent in the 2C1.4C1 ways of snapping the opposable primate digit that rigorous experiential research has shown results in 6 thuds and 2 snaps with a probabilty of 1.