This paper proposes a system for performing on-the-fly mixing of audio sources to produce spatialized sound. It introduces a constraint system linked to a graphical user interface representing the sound sources and connected to a spatializer. The constraint system expresses various sorts of properties on the configuration of sound sources. When the user moves one source through the interface, the constraint system is activated and attempts to enforce the constraints that may have been violated. The resulting system allows mixing on the fly, while letting the user choose between several listening viewpoints in a coherent manner. The design of the system and an audio implementation using Microsoft DirectX API are reported.:
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