In this paper we present an approach to instrument augmentation using the musician's ancillary gestures to enhance the liveliness of real-time digitally processed sound. In augmented instrument praxis, the simultaneous control of the initial instrument and its ' electric/electronic extension is a challenge due to the musician's physical and psychological constraints. Our work seeks to address this problem by designing non-direct gesture-sound relationships between ancillary gestures and subtle sonic effects, which do not require a full conscious control of the instrumentalist. An application for the electric guitar is presented on the basis of an analysis of the ancillary movements occurring in performance, with specific gesture data acquisition and mapping strategies, as well as examples of musical utilizations. While the research work focuses on the electric guitar, the system is not instrument-specific, and can be applied to any instrument using digital sound processing
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