Patchblocks allows the user to program and customise how their mini synth behaves; it can be an audio oscillator, sequencer, drum machine, effects unit - the limit is your imagination.

http://www.maker.ie/patchblocks.html

• 50 mA +12V
• 25 mA -12V
• 30 mA 5V
• 30 mm Depth

No info about availability.