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When you put a moderate voltage through your body it will cause muscle action (try putting 1000V at low current between fingers of the same hand for safety). The original experiment that suggested that electricity is used involved applying a shock to the legs of a dead frog (see the Wikipedia entry for Luigi Galvani).
For this claim about sound to be valid the electric shocks would have to cause sound in the nervous system. Also sound impulses would have to trigger nerve action (IE the “brown note”). AFAIK neither of these have been proven.