This work addresses the general problem of designing graphical user interfaces for non expert users. The key idea is to help the user anticipating his actions by displaying, in the interaction area, the expected evolution of a quality criterion according to the degrees of freedom which are being monitored. This concept is first applied to the control of sound spatialization: various perceptually based criteria such as “spatial homogeneity” or “spatial masking” are represented as a grey shaded map superimposed to the background of a bird’s eye view interface. After selecting a given sound source, the user is thus informed how these criteria will behave if the source is being moved to any other location of the virtual sound scene.
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