It is important for a hearing aid manufacturer to test hearing aids under as many and as realistic listening onditions as possible. The ability of Oticon's new VSE system to simulate complex listening scenes in the laboratory makes it possible to study many aspects of spatial sound. Therefore, the ability of Oticon's new VSE system to simulate complex listening scenes in the laboratory offers important benefits. Thereby it can play an important part in expanding our understanding of the needs of hearing aid users and of audiology in general. The system is also very useful for demonstrating the richness of acoustical information available to listeners in everyday environments. However, its primary application is as a platform for the development of new hearing aid features that will ensure the maximum benefit for hearing aid users.