[fghfghgfhfg]

I'm rather unqualified as a critic of rain sounds - morning fog leaves about as much moisture on things as what people around here would call a light rain. But I agree, it really doesn't sound quite like rain. The more prominent sounds remind me more of a brook or partially open faucet draining into a plugged up sink, and there is some rather obvious white noise in the background.

I also have tinnitus, but it's nowhere near as bad as yours sounds. Something like this is more than sufficient for me to mask it. It's really only an issue for me when things are very quiet.

Anecdotally, I find it much easier to concentrate with extremely loud music, usually with a strong and at least moderately fast beat. Even if I were to turn this up to 11, I don't think it would help me very much, aside from possibly masking background sounds that might grab my attention. At normal levels, I don't see it making any difference at all.