How to trigger instruments on key release in Reason 3 or 4

This music production software tutorial describes a hack to allow you to trigger an instrument or effect when you RELEASE a key in Reason 3 or 4. This is useful for guitar strums, Hi-hats, mutes or delays, or vinyl scratch effects. With this trigger trick you can create back beats easily. Have one effect produced when you push a key, and another when you release the key using release gates in Reason 3 or Reason 4.