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Zirkonium 3.1 - a toolkit for spatial composition and performanceZirkonium is a set of Mac OSX software tools to aid the composition and live performance of spatial music; the software allows composers to design multiple spatial trajectories with an intuitive GUI and facilitates arranging them in time. According to the provided trajectory information, the actual audio signals can then be rendered in realtime for 2D or 3D loudspeaker systems. For developing the latest version of Zirkonium, we focused on improving the aspects of usability, visualization, and live-control capability. Consequently, a number of functionalities, such as parametric trajectory creation, additional grouping modes, event-filtering, auto-event creation, automatic interpolation are implemented. Furthermore, ZirkPad, a newly developed iOS application, enables multiple performers to control Zirkonium remotely with a multi-touch interface and spatialize sounds in live performances.