Fascinating!
We used to live in a really old log home here in NE OH. It was made of huge chestnut logs, the likes of which no longer exist since the blight took all the chestnut trees.
On very humid or windy days you could hear voices in an otherwise empty house; a man, a woman calling, children laughing. It wasn't 'creepy' coz it was so cozy-family-sounding. My dad said it was sound virations trapped in the wood, and the waves were released under the right atmospheric conditions.
Sure enough, when we took a drinking glass and stood with ear pressed to it on one of the windowlogs, the voices were amplified so you could actually hear snatches of words.
Was Pop right? Who knows.
The older I get the more convinced I become that there is a rational explanation for even the strangest phenomena.