A few years ago I could not get hearing aids that worked for me. New technology has made louder hearing aids. Hearing aid works very good on my right ear. My left hearing aid has twice the volume as the right hearing aid it is almost as loud as it needs to be. With both hearing aids I hear good. They were working about 95% yesterday until the idiot doctor deleted both programs. Today they are both screwed up so bad I can not hear with them at all , sounds like electric clothes dryer tumbling 50 empty glass bottles. I have another hearing aid adjustment today at 3:30 pm I hope it is with the assistant he is much better getting them adjusted than the doctor.The tone controls circuits you found have a very gradual amount of boost as a 1st order passive filter. The equalizer circuits boost with about a 2nd or 3rd order filter. You need a 7.5th order filter. You need a lot of boost beginning at ONE frequency, 1kHz. What happened to your hearing? Did you play with guns?