During the workshop, Patrick distributed copies of the open-source graphical programming environment Puredata. After discussing different aspects of sound and how to create your own unique sounds, the group plugged into a mixer and and had a free-form aural exploration/jam session.
You can download the tutorial patch Patrick used for his workshop here.
The MEGAPOLIS patch requires a download of pd-extended (in 2010 v0.41.4) in order to run correctly.
Some sound clips made at the festival: