Jean-Luc Deladrière blogged about his MozMo build:
Mozzi by Tim Barras is an outstanding library that allow the Arduino to produce complex and exiting sounds with almost no additional hardware.
(In fact MozMo uses the hifi mode that requires … 2 resistors and a cap !) The idea was to build a dirty cheap modular synth exploiting the vast potential of this library.Features
Arduino compatible with Usb connection
Powered via Doepfer 5v bus or via Usb (via jumper)
Uses Mozzi Hifi mode
2 potentiometers
2 CV entries
1 gate entry
1 audio out
Depth : 40 mm
Size : 6 hp
More details at Elek101 blog.