This is a demonstration of 12Step - a sequencer with a "novel musical interface", developed by Ted Hayes at the Interactive Telecommunications Program (ITP) for New Instruments for Musical Expression (NIME).
Software used: Puredata 0.41.4-extended, Ableton Live 8, Native Instruments Akoustik Piano.
The video demonstrates mode changes, weight randomization and multiple concurrent sequences.
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This is one video that synthesists cannot miss