The Gallery Organ was once easily recognised by its unusual asymmetric façade – only the central organ case is original, the left and right wings added by Robert Navaratnam, a local organ builder. The action, once electropneumatic, was converted to direct-electric by Navaratnam This caused occasional problems with non-sounding notes and ciphers, resulting from the ingress of dirt into an open building and the general humidity. In the latest rebuilding of the organ, a new tracker action was built to replace the electric action. It is to date, the oldest playable organ in Singapore and is still regularly used for Masses and organ demonstrations.