Thongjy,
When mine started in October I heard all kinds of noise. I would shift back and forth between hissing, and single-tone ringing in my right ear, and single tone ringing in the center of my head (usually at night), then "crickets" chirping in both ears, and then pulsating, wave-like churning, like an ear infection, in my right ear. I also heard a morse code tone in my right ear late at night, in bed, but only at times when the other sounds were quieter.
Now, I seem to just shift back and forth between high-frequency hissing in both ears, and a kind of waxing-and-waning ringing in my right ear.
Based on my experience so far, I think tinnitus may settle into a regular pattern with time.
I am still not officially considered "chronic." I guess my brain is still deciding what it wants to do.
It's probably true that the less you monitor the pattern, the more your brain tends to shut it out.