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Miketron converted his random MIDI note generation software(MAC/PC) into hardware form via an ATMega168 chip –

A couple of months I took my MAX/MSP code for Random7 and rewrote so I could embed it into a hardware version.  Random7 Hardware Version 1 (R7H) is a very basic version of the Random7 software.  The core element of R7H is still the same,  the program pick from 7 different midi notes randomly.  As of now the key R7H is preset to the key of A Major, and the only control is a potentiometer that controls the speed of R7H.  Output for R7H is a midi port, an on/off switch, and there is also a red led the flashes everytime a note is sent.

More pics of the device can be seen over at Illuminated Sounds.