Generally, David's ability to access and control his personalities/powers is closely tied to his self confidence and self esteem: the better he feels about himself, the more control he exercises. Unfortunately, David often suffers from self-doubt and self-recrimination, meaning that he must struggle to remain in control. Following the Age of X, David briefly used a Neural Switchboard Wristband engineered by Doctor Nemesis, Madison Jeffries, and Reed Richards. This device allowed Legion to utilize a personality's power set for several seconds without being overwhelmed by that personality. However, he soon abandoned this and attempted instead to develop a more organic control over his personalities.