From Music Hack Day
 Grid Pie
Renoise cut and pastry.
 About the hack
Renoise is a sophisticated music sequencer and audio processing application with a mod tracker interface. One of the new trends in our community is the concept of a meta-interface. In essence, users use the Lua API to transform Renoise into something else, hide the Renoise window, and work with hardware interfaces connected to their own scripts. Three current examples:
Grid Pie is "yet another meta interface". It turns Renoise into a live performance audio recombination machine.