Please use headphones/earphones as you go through this process.
Checking your suitability for treatment is a three step process that you will go through by following the on screen instructions. The overall purpose of the process is for you to match (as best you can) the frequency and volume (overall sound) of your tinnitus. It is important that you spend time following these steps to ensure that your treatment is as effective as it can be. The goal is not to mask your tinnitus, but to match it.