A preferred treatment regimen is as follows:

(i) The individualized sine cluster is determined as described herein.

(ii) This sine cluster is played to the subject for 15 minutes, followed by 45 minutes of pure tone.

(iii) The same sine cluster is played for 30 minutes followed by 60 minutes of pure tone.

(iv) The same sine cluster is played for 60 minutes followed by two hours of pure tone

(v) The order is reversed, so that pure tone is played first for 45 and then the sine cluster is played for 15 mins.

(vi) The pure tone is played for 60 minutes followed by 30 minutes of sine cluster.

(vii) The pure tone is played for 2 hours of pure tone, followed 60 minutes of sine cluster.

Experimentally, results are measured and recorded for each cohort after one session, and after one week of doing one session daily, and then finally after one month of doing a treatment session 3-5 times a week.

Below are a number of records from experiments carried out by the inventor.

Aim: To determine subject's upper hearing limit.

Assumptions: Normal level of person-to-person conversation is ?60-70 db

The frequency range of human hearing is ?10 to (up to) ?20000 Hz.