Amp is a hack used by players in New Cap City to boost their reflexes and reaction time. In V-world, amp takes the form of a drug injected into the user's eye. Overuse of Amp leads to addiction.
Emmanuelle introduces Joseph Adama to Amp while helping him track down his daughter Tamara's avatar in New Cap City, and he uses it to eliminate the crowd at the Mysteries club after he is thrown out (CAP: "Ghosts in the Machine"). Adama begins to overuse the hack, much to his guide's concern (CAP: "End of Line").
Abusers of Amp are referred to within the game as "Ampheads" (CAP: "Ghosts in the Machine").