The Bubblegum Sequencer is a physical step sequencer that lets you create drumloops by arranging colored balls on a tangible surface. It generates MIDI events and can be used as an input device to control audio hardware and software. Finally, people can't claim anymore that electronic music isn't handmade.
For more information, visit http://backin.de/gumball
Update: In some instances, the sequencer plays notes that aren't actually on the table. This is due to the computer vision picking up background light and general noise.
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and i assume fairly cheap