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FX-322 apparently only goes deep enough to target 12+ kHz and FX-345 supposedly only goes deep enough to target 4+ kHz, so since my losses are at 0.5-2.5 kHz (under 4 kHz) I would not expect either of them to help me as-is. I don't have broad high-frequency age-related hearing loss, I have...

I would not say it's accurate to say FX-322 "does not work" in humans. Firstly, it is shown that the treatment only penetrates the cochlea to cells responsible for transduction from 12 - 20 kHz. There is very little (well, less) 'important' spectral content at those frequencies for humans...