See rewind.
reservoir
Spring-loaded bellows for storing or for storing and regulating the wind supply from a pressure pump or the suction supply from a vacuum pump.
residence organ
Pipe organ made for residential use, often softly voiced.
resonator
The wooden or brass body of an organ pipe. Misnomer for tuning weights in musical boxes.
reverse
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.