The Ad-lib system is a feature used predominately in Resident Evil Outbreak and Outbreak File #2. This system mapped various pre-selected phrases to the right analog stick and the L2 Button, allowing the player to communicate with their teammates. In online play, this system was used instead of traditional voice chat. Resident Evil 4, 5, and 6 used similar features so that player characters could communicate, though the latter two use voice chat for online play. But unlike the ad-lib system they are not as comprehensive.