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The reactable, is a multi-user electronic music instrument with a tabletop tangible user interface. Several simultaneous performers share complete control over the instrument by moving physical objects on a luminous table surface. By moving and relating these objects, representing components of a classic modular synthesizer, users can create complex and dynamic sonic topologies, with generators, filters and modulators, in a kind of tangible modular synthesizer or graspable flow-controlled programming language.

This instrument is being developed by a team of digital luthiers (Sergi Jordà, Martin Kaltenbrunner, Günter Geiger and Marcos Alonso), at the Music Technology Group within the Universitat Pompeu Fabra in Barcelona, Spain.

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