Interesting. It seems my tinnitus is around freq 8200. I'll give this tool a go when I'm in a more quiet environment.
Been living with that high a tone for decades now and it's always been extremely noticeable.
I always coped with it by convincing myself "that's just my brain's CPU frequency" - sounds a bit nutty but that's a coping mechanism which worked for me.
Tried seeing my doctor about it a couple of years ago (UK, NHS GP) but at the time he dismissed it saying "nothing can be done" :/
This tone therapy - I'll try this and see how it goes.
Does it do that to you as well?
The sounds were pretty annoying but at least I could control their intensity and while going to sleep I could gradually make it lower and lower until I slept.
The ringing was totally gone in between the tones but as you know it's really a short span.
You say you're used it twice and it failed, I don't think you can conclude that. You can read section 2.5 in the paper. Here it mentions treatment of 4-6 hours a day not split into sections shorter than an hour and over ~12 weeks.
If you fall asleep with some earphone in maybe that also counts the time?
Then it's easier to get such a high number therapy. E.g. one walk session a day for 1 hour. And then 3 hours at night until you wake up groggily and take of the earpieces and continue sleeping.