I have tinnitus and haven’t talked about this with other sufferers so this may just be me. But if I slowly plug and unplug my ears, the difference between tinnitus and all the background shit is obvious. The only way I can describe it is that the sound comes from a different place and when you change how your ear works, you can hear the differences between the sources. My hearing is awful so I really pray this anecdata is of no use to you.