Didn't work for me as I have this annoying frequency sound somewhere in my space that I can only hear from my bed when it's quiet. I can usually blend it out but as I was focusing on these, that sound suddenly became unbearable. Please help! I hate this noise and haven't been able to locate where it comes from for months now!!
Is it a machine noise? There's a building across the street from my house that has an annoying HVAC thing on the roof that I'd like to sabotage...
someone3011