An apparatus for providing settings of a control system (9) for implementing a spatial distribution of perceptible output in a physical space (1-4; 17), which control system (9) is configured to control at least one output device (6-8,45-48) positioned in that physical space (1-4;17) and to maintain in memory (15) data (56-60) representative of locations associated with the respective output devices (6-8,45-48) in the physical space (1-4; 17) relative to a reference point (26), includes an input device (27,28) for obtaining user input pertaining to at least one location associated with one of the output devices (6-8,45-48). The settings are based on data representative of the user input. The input device (27,28) includes at least one component (27) for manipulation by a user to position at least a first point (31) on the component (27) and a sensor arrangement (28) arranged to provide output for detecting an angular co-ordinate of the first point (31) about at least one axis through a second point (30) of the input device (27,28).