The architecture and function of the release version of a spectroscopic simulator NMRScopeB is described. It includes the jMRUI-related GUI and an open-source calculation server communicating with the kernel via sockets. While standard metabolite set simulations needed for quantitation by jMRUI or LCModel can be prepared in a few steps, more complex research task can be handled as well. The operation is described by control and data flow charts. After a period of beta-testing, the simulator is released as part of the recent jMRUI package.