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This hypothesis has been around for decades and the study of it has failed to generate enough positive data to lead us to believe that sound waves instead of ion flux is how impulses are generated. Just because we don't know yet how many anesthetics work at the molecular level doesn't mean that they have to work by inhibting sound waves. We don't know how gravity works either but that doesn't mean that current theories of gravity are worthless, it just means we don't have the right foundation of knowledge or the right tools to understand it yet.