This paper presents recent developments in interface design for the diffusion performance paradigm. It introduces a new custom-built iPad application tactile.motion, designed as a performance interface for live sound diffusion. The paper focuses its discussion on the intuitive nature of the interface’s design, and the ways it aims to increase expressivity in spatial performance. The paper also introduces the use of autonomous behaviors as a way to encourage live control of a more dynamic spatial field. It is hoped that this interface will encourage new aesthetics in diffusion performance.