ApplyKeyReduction() - Attempts to delete keys that lie within the given time range.
Parameters:
Control *cont - The controller whose keys to reduced. Interval range - The time range within which to delete keys. float thresh - After the key reduction, the controller's values at each step are guaranteed to be within this distance from their original values. TimeValue step - The controller will be sampled in steps of this time increment. KeyReduceStatus *status - The callback object used to report the key reduction status and control continued processing.