If it's that tapping in the back of the head for like a minute you're talking about, it seems to work for some people and just temporarily the tinnitus always come back. I've tried it a bunch of times and i worked for me only once for example.
Just by knowing about alt+C blows my mind, i've been using fzf for a long time now and i basically just use ctrl+T with it, i don't know why i never looked into more shortcuts with it.