Source code for 6 C++ classes and a main function, meant to be compiled with the OpenSim source. The main function should be familiar to people who looked at the "Creating a Customized Muscle Model" tutorial (http://simtk-confluence.stanford.edu:8080/display/OpenSim/Creating+a+Customized+Muscle+Model). The commented source code of the 6 provided classes should be readable to people familiar with OpenSim's API.