Yes possibly. I was trying to think of how you describe the sound I am talking about and it sounds similar to when you call a fax line same kind of different tones happening. I honestly think in my case there could be some poor wiring making an odd frequency sound most people can’t hear. Probably should look more into or try to locate it. But you could be right about it being something with the frame work. Everything has to be so quite to head it, it’s near impossible to find I think though... or maybe it’s some thing else odd happening. One day late at night I’ll try going outside and see if it is all throughout the city.