I just wanted to loop back and say when I lower my Keppra dosage, it seems like night and day now, so it has provided some benefit. The more chaotic tinnitus seems to stabilize into continuous noise which is far preferable in my opinion. It goes from sounding like I'm on a battlefield to more of a varied but much more stable shhhhhhhhhhh.
Now I have to point out my tinnitus is very weird. I am one of (not trying to make myself sound special) the only people I have seen that literally has cycling noise, whereby sets of noise are mutually exclusive. I still don't really know what triggers that. So YMMV.