Iris send me some pictures of here sound box. The electronics of the sound box consists of two and some schmitt trigger oscillators. The two oscillators are wired to the stereo jack and can be slightly detuned to get a spatial stereo sound. The sound box has some potis and switches to control the sound. There is also a light sensor which can be used to influence the sound.
Here are the picutres of this nice little Synthi: