This has happened to me a few times and it proper freaked me out at first. Woke up about 3am to this banging sound downstairs, went to check and two of the upper cabinets were wide open.
Yeah I noticed it straight away, stopped me dead. It wasn't just a slight drop either, it was like walking into a freezer compared to the rest of the corridor.
Been going back and forth on this one lately. The landing marker theory gets dismissed pretty quick by most researchers now but I dont think its completely dead, more like it gets lumped in with...
Audacity is your friend here. Free software, proper audio analysis tools. You can isolate frequency ranges, apply noise reduction filters, zoom in on specific sections.
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