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Apr4-11, 03:25 PM
P: 3,387
1. Random background noise won't be easy to 'tune into'. You'd need a dynamic system to constantly adjust it for the harmonics - another energy drain.

2. There is significantly more energy in a wrist movement than there is in sound of this scale. So it's not something you can compare up doing. You'd be better off putting wind turbines on the skyscrapers.