never heard of the humming specifically but i read a load of accounts where people describe a kind of pressure or vibration right before missing time, almost like something is messing with your inner ear or temporal lobe. makes me wonder if its a physical effect of whatever is happening rather than just psychological.
theres actually a researcher - i forget his name off the top of my head - who tracked this symptom across like 40 reported cases and found it was one of the most consistent pre-event details. way more than the classic bright light stuff.
did the humming feel like it was coming from inside your skull or external? that distinction seems to matter in a lot of the cases ive looked at. curious if anyone else has noticed a pattern with location too, like whether this happens more in rural areas or near specific terrain.