Velocity to Probability - Max for Live Device

This is a Max for Live device, which you can download here:
http://milkcrate.com.au/_other/downloads/M4L/little-scale_vel2prob.amxd

A velocity of 0 means that a note has 0% chance of being played. A velocity of 64 means that a note has 50% chance of being played. A velocity of 127 means that a note has 100% chance of being played. And so on.

Simple but useful.