A hydraulic system comprising; a hydraulic machine (10, 150), the hydraulic machine comprising a rotatable shaft, a low-pressure manifold (30, 174) and a high-pressure manifold (40, 170), and one or more working chambers having a volume which varies cyclically with rotation of the rotatable shaft, each working chamber having both a low-pressure valve which regulates communication between the low-pressure manifold and the working chamber, and a high-pressure valve which regulates communication between the high-pressure manifold and the working chamber, wherein for each working chamber at least one of the respective low-pressure valve and the respective high-pressure valve is an electronically controllable working chamber valve (28, 36); the high-pressure manifold extending between the one or more said working chambers and one or more actuator ports and one or more additional outlets; one or more hydraulic actuators (56, 180) which are fluidly connected to said high-pressure manifold through the one or more actuator ports and thereby hydraulically driven by the hydraulic machine; one or more electronically controllable outlet valves (47, 190) which regulate the opening or closing of the one or more additional outlets; and at least one controller (26, 158) configured to control the one or more electronically controllable working chamber valves and the one or more electronically controllable outlet valves; wherein the at least one controller is operable to receive a demand signal (60, 300, 400) and to regulate the one or more electronically controllable working chamber valves in phased relationship to cycles of working chamber volume to thereby regulate the net displacement of working fluid by each working chamber on each cycle of working chamber volume, and to concurrently regulate the one or more electronically controllable outlet valves, to thereby regulate the net displacement of working fluid into or out of the high-pressure manifold allowing for the flow of working fluid out of the high-pressure manifold through the one or more additional outlets, when one or more additional outlet is open, to meet a demand indicated by the demand signal. a hydraulic machine (10, 150), the hydraulic machine comprising a rotatable shaft, a low-pressure manifold (30, 174) and a high-pressure manifold (40, 170), and one or more working chambers having a volume which varies cyclically with rotation of the rotatable shaft, each working chamber having both a low-pressure valve which regulates communication between the low-pressure manifold and the working chamber, and a high-pressure valve which regulates communication between the high-pressure manifold and the working chamber, wherein for each working chamber at least one of the respective low-pressure valve and the respective high-pressure valve is an electronically controllable working chamber valve (28, 36); the high-pressure manifold extending between the one or more said working chambers and one or more actuator ports and one or more additional outlets; one or more hydraulic actuators (56, 180) which are fluidly connected to said high-pressure manifold through the one or more actuator ports and thereby hydraulically driven by the hydraulic machine; one or more electronically controllable outlet valves (47, 190) which regulate the opening or closing of the one or more additional outlets; and at least one controller (26, 158) configured to control the one or more electronically controllable working chamber valves and the one or more electronically controllable outlet valves; wherein the at least one controller is operable to receive a demand signal (60, 300, 400) and to regulate the one or more electronically controllable working chamber valves in phased relationship to cycles of working chamber volume to thereby regulate the net displacement of working fluid by each working chamber on each cycle of working chamber volume, and to concurrently regulate the one or more electronically controllable outlet valves, to thereby regulate the net displacement of working fluid into or out of the high-pressure manifold allowing for the flow of working fluid out of the high-pressure manifold through the one or more additional outlets, when one or more additional outlet is open, to meet a demand indicated by the demand signal.