@TheCobbler,
Cobbler, I just found this...
So there is something to this.
Like, hearing the sound of tapping keys on a keyboard.
I looked briefly, and there are a number of videos on youtube with people making these whispering, clicking, crinkly, soft scratching sounds with various objects.
At first it seems, well, strange. Yet after awhile, yes, relaxing. Like it's something deeper than the mere sound they are making.