The Gallery organ at St Andrew's on the Terrace was built by George Croft. 1962. It has two manuals and pedals: Swell 10 stops; Great 9 stops; Pedal 9 stops. Floating mutations: 3 stops which may be coupled to either manual and pedals. Electro - pneumatic action. Great and Swell on slider chests, with unit extensions to derive several of the stops in the Great and Pedal.