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e c———it———a———t——i———o—n do——w———n———l———o———a——d—— A. Freed, J. MacCallum, A. Schmeder. Composability for musical gesture signal processing using new OSC-based object and functional programming extensions to Max/MSP. In Proceedings of the New Interfaces for Musical Expression Conference. Oslo, Norway. 2011. An effective programming style for gesture signal processing is described using a new library that brings efficient run-time polymorphism, functional and instance-based object-oriented programming to Max/MSP. By introducing better support for generic programming and composability Max/MSP becomes a more productive environment for managing the growing scale and complexity of gesture sensing systems for musical instruments and interactive installations.