In order to convey the manifold possibilies of surround sound design in the new MUMUTH concert hall to a broad audience we present the development of an easy to use application which allows to run and interact with several audio demonstrations from a mobile computing device. An extensible number of such demonstrations using the large-scale and variable loudspeaker hemisphere in the hall are controlled with a user interface optimized for touch-sensitive input. Strategies for improving the operating safety as well as the introduction of a client/server model using the programming language Pure Data are discussed in the context of use with a 3D Ambisonics rendering server, both implemented using the Linux operating system.