A sound begins in the far distance. It is very quiet but maintains a certain pitch, that doesn’t change. It is like a hum, very gentle and subtle. It’s low hum can faintly be heard. Slowly, the noise gets louder and louder, as it moves closer to me. As it comes closer, more characteristics of the noise become clear. A very percussive rattle slowly crescendos into perception. It is very faint, and has a high/medium range.
As the noise comes towards me, it continues to get louder. As it passes me, it reaches its highest volume, almost deafening me for a few brief seconds. At this point I can hear everything from this one sound source. The once gentle hum is now aggressive, as it roars past. It is almost like a growl, it has a coarse aggression to it. The rattling is at its loudest, like its trying to take over the hum.
Soon its moves away behind me. A very high pitched screech comes a few seconds after it passes. The noise pierces my ears, it’s bright timbre soon ends. The noise halts in it position, before taking off again, getting further and further away, fading into nothing.