555Hz Pure (all 9 Solfeggio frequencies divided by 9)
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I recommend that you listen with other music if the noise bothers you. this tone can be listened to with or without headphones.
If you have an important question please send it to me privately, I am more likely to answer it that way.
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This tone is all nine Solfeggio frequencies divided by nine, the Solfeggio average if you will. I hope you enjoy.