An apparatus comprising means for: obtaining an indication of a variable position of at least one user in real space; mapping the position of the user in real space to a position of the user in a sound space; controlling an output audio signal, for rendering a sound scene by a loudspeaker, the sound scene being defined by the one or more sound sources of the plurality of sound sources that are within a sub-volume of the sound space that excludes the position of the user in the sound space and that is sized in dependence upon the position of the user in the sound space.