1. Rewind (also listed in this Glossary). 2. In twin-tracker instruments (such as the Nelson-Wiggen Selector Duplex Organ and the Empress Twin Tracker Solo Expression Piano) in which a double-wide roll has half the tunes perforated in one direction and the other half in the opposite direction, reverse actuates the mechanism which reverses the direction of the roll after the tunes on one side are finished, and switches over to the other half of the tracker bar.