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This article presents a physical modeling synthesis environment for valved brass instrument sounds. Synthesis is performed using finite-difference time-domain methods which allow for flexible simulation of time varying systems. Users have control over the instrument configuration as well as player parameters such as mouth pressure, lip dynamics and valve depressions which can be varied over the duration of a gesture. This article introduces the model used in the environment, the development of code from prototyping in MATLAB and optimisation in C and then incorporation of the executable file in the Soundloom interface of the Composers Desktop project. Planned additions to the environment are then discussed. The environment binaries are available to download online along with example sounds and input files.