Regarding Keppra, I have mixed feelings about it. I have trialed it and it might have introduced new sounds but, on the other hand, it did quite a bit with my mood. It also gave the feeling of the tinnitus moving further away, and not being as reactive, along with improving my hyperacusis. But since I stopped taking Keppra, things are basically back to the same.
We are all different but I would make sure that if you try it, follow the dosage regime and make sure you have a doctor with you on it. Also take regular blood work since it metabolizes through the liver.