A couple of hours ago I was trying to WILD. And failing. But that's not the point.

Anyways, after awhile I heard a sort of high-pitched, soft humming noise (I was also halfway into SP). When I focused on it, it got louder, and when I stopped listening to it it got softer. I kept waiting for it to sort of whoosh, then go into the weird high-low-high-low-high-low pitched sound that I've heard both times I got close to a WILD.

It's not an auditory HH; I can hear it any time it's quiet, the quieter the better. I would say I can even hear it now, but it might just be the computer running. I read somewhere on this forum that it's the central nervous system working.

Does anyone know if it can be used to initiate a WILD? If so, then how? I tried focusing on it and willing it to get louder (which worked to a certain degree) and ignoring it. Neither way got me very far... I'm not the only one who hears this, am I?