I've experienced most of the above at one time or other. Spent 10 minutes trying to find the radio I'd left turned on somewhere the other night but once all were accounted for I could still hear murmuring voices. It was 2 blokes having a yarn in the park next door on their way home from the pub before they parted ways. duh!
More than once I was out of bed and halfway up the hall to answer Mum calling out my name before it hit me that she was actually about 2 kilometres away in the aged care units. I've wondered had she had died would I have presumed she was 'haunting' me? It was very real, and very loud. But it didn't actually happen, the mind plays strange games.
After we moved from Sydney we both 'heard' the old house's front doorbell ring in the new house occasionally at night. Just a coincidental conversation brought that particular weirdness to light. We were both convinced that we were the only one who's mind was playing tricks. ... it gets worse! Sometimes, thankfully rarely, it still wakes me! I never think of the old house and haven't heard that bell for over 13 years...so why still that damned old doorbell??
Staying late at the office where I first worked was always a tad spooky. Gradually the silence would be replaced with all the usual day to day clatter and chatter as if everyone was still there only very much quieter. It wasn't scary, just very strange, and I never asked if anyone else experienced it.
I have one of those musical stove hoods too. It plays the bagpipes every time a Southerly is blowing.