Video recorded using direct audio out (rather than microphone and speaker/amp).
The sounds are produced by an electrochemical reaction between Aluminium, Copper and Salt water (NaCl), fed through a pre-amp after basic filtering via a capacitor and resistor.
The originally inspiration for the electrochemical synthesiser was the webpage "Peculiar Sounds of Aluminium" by Nyle Steiner. home.earthlink.net/~lenyr/alsounds.htm
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