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This paper deals with sound synthesis using state space models. It focuses on two realizations we made of state space synthesiser builders applied to the case of wind instruments and more generally to transmission lines networks. The first realization, written in Maple is devoted to symbolic manipulation such as the derivation of different formalisms - modal representation, ARMA filters or Kalman filtering equations. For efficiency purposes, a second version has been designed in C++ which directly reads the description of a physical instrument and computes its sound signal outputs.