The white manual keys are covered with bone whilst the black keys are made of ebony wood. The pedal white notes are made of maple, with black notes of rosewood. The draw-stops are by wooden with engraved bone faces.

Grace has a long musical history, with the preceding organ installed in 1931 by the Austin Organ Company of Hartford, Connecticut, (rebuilt in 1949). It included both chancel and gallery organs for a total of 84 ranks. The chancel organ is still extant in its case and playable but not presently in usable condition. The gallery organ has been removed, except for the pipes incorporated into the Casavant organ as mentioned. Much of it is in storage in the basement of the church. Specifications of the organ may be found on the Organ Historical Society Database.

The first organ in Grace Church's Broad Street building was a 3 manual, 22 rank organ built by Hall & Labagh (New York City, NY) and was installed in 1848 on a balcony in the North Transept. It was apparently unreliable, needing major repair every 10 years or so, being rebuilt four times in its lifetime. The final time it was rebuilt, in 1928, it was also enlarged and moved to a gallery in the rear of the church. A choir organ was installed in the chancel at the same time though no information exists about this part of the organ. Church leadership found that this arrangement was still unsatisfactory, and three organ builders were asked to propose improvements in 1930. Each one agreed that both organs were worthless and stood to gain little from further alteration. In 1930, the Austin Organ Co. was engaged to build a completely new instrument which would replace both organs.