Graphical virtualization techniques have been used for some time in the fields of archaeology, history, and heritage, offering better understanding and experience of past environments while also facilitating more effective user interaction. Despite significant advances in desktop computer processing and graphics hardware, in comparison, related sound design and audio processing techniques are usually quite basic and make little use of recent creative and technological developments. Used well, high quality music and sound design work with the imagination to evoke powerful images, recall strong memories and provide important auditory information about a virtual environment. Such use of music and sound design techniques is now commonplace in film and game audio. More recently, architectural acoustic modelling and measurement techniques have developed from purely lab-based research to become hands-on applications allowing, for example, real-time walk-throughs of virtual environments. Such applications are already used in architectural consultancy and the study of heritage sites, but how might these techniques be developed further, and what might they reveal about their source material? What can we learn about a building or environment from how it sounds? How successful are acoustic models in recreating an existing or virtual space and how might these results be reliably extrapolated to sites that no longer exist?