They raised the ceiling of the Organ Loft 11 feet (3.4 m) to accommodate a 26-rank tracker organ.

The church also has a historic tracker organ designed by Henry Niemann.

The church's organ, purchased in 1845, is a unique tracker organ designed by New York organ maker Henry Erben (1801-1883).

LEAD: "In the 18th century, the tracker organ was the most complex machine assembled by Western man."

In 1955 he formed with John Bright the Kney and Bright Organ Co to build tracker organs.

In a tracker organ, the connection between the manual and pedal keys and the valves that open the pipes is mechanical.

It was founded in 1961 by Charles Brenton Fisk (1925-1983), the first American organ builder to build significant tracker organs in the 20th century.

The interior features a gallery and organ loft has the original tracker organ, which is still hand pumped by a wooden lever on the north side of the case.

In a tracker organ, each key is attached to a thin strip of wood that links the keyboard to the pipes.

Both are large tracker organs in the current American-hybrid style, which combines 19th-century French timbres with German Baroque sounds.