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Today's technical systems are often very complex. System dynamics are often hard to predict for humans. However, understanding system behavior is crucial for evaluating design variants and finding errors. One way to cope with this problem is to build logical or virtual simulations. Logical simulations are often very abstract, but can simulate complex behavioral sequences. Virtual reality (VR) simulation is very good for experiencing the system in a view close to reality. However, it is very often static or has only limited dynamics. Until now both approaches exist in relative isolation. In this paper, we report on our experiences in building a mixed simulation, here a discrete event simulator (DES) is coupled with a virtual reality (VR) environment. We will focus on technical and conceptual challenges, but also present possible use cases for user interaction in this strategy to make more detailed investigations possible. Finally a prototype based on the simulation tool "SLX" and the virtual reality environment "Virtual Development and Training Platform" is used to evaluate the approach.