Contact needs enough voltage to penetrate the skin in order for it to penetrate through the body. The recommendation is between 14-20v.
Enable reduce amplitude < 10 kHz so that in the case of low frequencies, it does not shock the system terribly -- low frequencies can interact with the nervous system.
For more details, please check:
https://www.facebook.com/groups/spooky2/permalink/537374583091116/
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