That listing of 71 stops would include the 30-stop 1830 Henry Erben gallery organ, which was electrically-connected to the 1878 Roosevelt in the chancel.

From the NYC AGO NYC Organ Project: The original gallery organ and console by Henry Erben were still in use when in 1878 Hilborne L. Roosevelt of New York City completed a new organ in the chancel. A choir had been installed there to replace the solo quartette and choir which had sung for many years from the gallery. A chamber (still in use) was built for the chancel organ in the angle formed by the east wall of the south transept and the chancel wall. The chamber is actually outside the church walls and the organ spoke through what had been outside windows.

An echo organ, also by Roosevelt, was situated in the ceiling over the intersection of the nave and transepts; it consisted of two stops brought from the Machinery Hall of the Philadelphia Centennial Exposition of 1876: a Vox Humana and Quintadena.

Roosevelt connected the 1830 Henry Erben organ, moved to the present church in 1846, to the chancel console with an electric cable.

An exhibition of the new organ took place on May 22, 1878. Performers included Samuel. P. Warren (Grace Church), Henry Carter (Trinity Church), George W. Morgan (Brooklyn Tabernacle), Dudley Buck (Holy Trinity, Brooklyn), George W. Warren (St. Thomas Church) and several vocalists.

Updated through online information from T. Daniel Hancock. -- Listed by Radzinsky as 4 manuals and 71 stops.

Updated through online information from Douglas W. Craw.

Identified through online information from Douglas W. Craw. -- The Echo Division was the famous suspended division shown at the 1876 Philadelphia Exposition featuring the firms newly developed electric action.