SATIE (for Spatial Audio Toolkit for Immersive Environments) facilitates the prototyping of immersive spaces with advanced spatialisation capabilities. It is an audio spatialization engine capable of rendering live audio scenes that are both dense (several hundred sound sources) and dynamic (creation, deletion and individual control of sound sources). SATIE can be used with the SuperCollider language and with its OSC protocol, allowing control from external tools such as 3D engines, such as Blender and Unity3D, and such as OSC enabled programming languages.