We create soundscapes for public spaces. Not music, but pure sound totally connected to the architectural environment, the space. To support the architects concept, to intensify the awareness of his creation - and the purpose of the building. A sonic experience, almost imperceptible, neither disturbing nor dominant, the interaction between silence and environment. Our digitally programmed and fully automated “Interactive Sound Device” (MSP/PD) processes and composes a unique sound environment for every location. The authentic sound material is triggered from the building’s own database (sound library). The process is controlled and determined by a multi-sensor setup which continuously sends data about conditions, public, function, influences, etc. The resulting creation is a sound environment in motion, which never repeats; connected in every moment to the concrete situation and the particular requirements of the space. Auditory perception is the most important awareness next to form, shape, material, colours, light, temperature, (aural architecture). Strongly attached to modern architecture, our approach to sound and environment is determined by aspects of synergy, the influence of space on our internal senses, connecting our interior by sonic consciousness to the interior of our environment. Our priority is the function of the building rather than the creation of an art form. SDFA works with international architects and developers of modern building projects. Our concept is totally integrated in the overall concept and forms part of the presentation and budget. Each unique architectural space gains added sensory significance through use of our sound design.