In 1927, the expansion of the organ began. The Solo division was revised and transferred to the chancel and tonal changes were made elsewhere in the instrument. A fifth manual was fitted to the console in preparation of the addition of the Celestial organ, completed in 1930. Located in the dome 110 feet above the crossing, this department contains manual and pedal divisions under expression. Ethereal celestes, colorful flutes, orchestral reeds, and brilliant trumpet stops on 15 and 25 inches of pressure are included in its scheme. The acoustically reflective dome imparts a distinctive quality to these voices.
The west gallery divisions were replaced by Æolian-Skinner in 1937. With the gathering interest of the time in the performances of baroque music, the new gallery Great, Swell, and Pedal (along with a six-stop Positiv, removed in 1953) were designed to provide proper resources for the playing of contrapuntal music. The specification and finishing of the new west gallery organ was under the direction of G. Donald Harrison, an ex- director of the Willis organbuilding firm in London who joined the Skinner Organ Company in 1927.
The chancel divisions were revised by Æolian-Skinner in 1953 and a small new Positiv was added in the chancel. At that time a new five-manual drawknob console was installed in the south chancel bay.