It could be two things, from my perspective:
- Your tinnitus volume increases or new tones appear as a result of (even moderate) noise exposure. These 'spikes' (if you will) usually settle after a few hours. Some people think this is because one has hyperacusis or TTTS.
- You hear strange noises over or within (certain) external sounds (sometimes as if they're coming from that sound or originating within it). Specifically, white noise, such as rain, wind, a streaming river, and so on. As soon as the auditory input of that external noise dwindles, so does the 'reactive T'. This is usually, more accurately, called 'dysacusis' by some. That or hearing distortion. The most typical sounds you will experience together with white noise, are whistles, beeping or ringing. But it varies for everyone, just like normal T does, I guess.