From Music Hack Day
An open-source real-time multi-user audio sequencer.
 by Team Nodejitsu
Marak Squires - Created project, invented the JSONloops format, built core sequencing code
Elijah Insua - Writer of C bindings, solver of the hard problems
 About the hack
Read the github for more details. Also, we accomplished our goal in the allotted time, which I find insane.
 What APIs, tools or kit did you use?