http://www.handmadeelectronicinstruments.com Built inside a reused jar, this drone synthesizer consists of triple square-wave oscillators modulating against each other. The pitch of each is controlled by outside light sources hitting the two three sensors inside, so there is a lot of room for experimenting. Reacts well in dark settings with light sources such as flash lights, fire, video monitors, the sun etc. There is a single switch on top for power which is supplied by an included 9-volt battery. A red LED indicates power and a 1/4" output jack makes it easy to connect to amps, effects, or recording equipment. ... https://www.youtube.com/watch?v=2oTGZ12tHE4

Three square-wave oscillators with 3 step sequencer. ... https://www.youtube.com/watch?v=qrcR8M4VtKY

HandmadeElectronicInstruments.com ... https://www.youtube.com/watch?v=hADfO8WL4mM

http://www.handmadeelectronicinstruments.com/ Housed in a very rugged and well used slide case, this synthesizer is capable of extremely dense sounds. The controls can be broken down into two sections, the drone and the auto-step synthesizer. Each section has it's own filter, volume control, and on/off toggle to blend the sounds. There is really nice cross-talk, especially in the way the auto-step will warp the drone section. Above, the drone section consists of two oscillators that modulate each other while a third selectable LFO adds more interesting rhythmic sounds. This creates a nice thick bed. Below, the auto-step section is based on a stepped-tone generator but with a sweeping LFO, giving it an almost automated looping effect. This is controlled with speed, frequency, and pulse length.

With a 1/4" output jack it is easy to connect to amps, effects or recording equipment. It is powered by an included 9volt battery or any 9volt center-negative DC adapter. This was designed and hand-built in Oakland, California. ... https://www.youtube.com/watch?v=YPpCuceJ3xA