Aquired by absorbing souls of the deceased members of Cloudbank (called "Traces") or by leveling Red up, Functions are the means by which Red upgrades the Transistor. Functions can be applied to the Transistor in one of three ways: Active, Upgrade, or Passive. The Active ability of a Function defines what the Function does when it is used. The Upgrade ability of a Function defines how it modifies another Active Function to which it is applied. The Passive ability of a Function applies an effect to Red which is either always in-effect, or triggers automatically based on described circumstances.