These were built as a matched pair. It is played by bridging a connection between the two large contact handles. The pitch is controlled by the amount of resistance. The more resistance or lighter touch produces lower frequencies. This oscillator is then modulated by a LFO, giving this device very nice throaty, almost vocal sounds. It can also be played through multiple people creating a human chain.
The three large knobs control the speed of the LFO, a low-pass filter, and volume. It is powered by an 9volt battery. A green LED indicator flashes in sync with the modulation. 1/4″ audio output.
This was built using repurposed cigar boxes, salvaged handles, and new as well as salvaged components.