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Here's the thing I keep thinking about...
Imagine you have a large window that you look through to a fantastic vista.
But you can't hear what's going on in that vista because all the doors are closed to keep the elements out... or maybe it is an elevated window that is completely & permanently sealed against the elements.
But you want to hear the waves crash against the shore, or the noise of the bush or the bray of the donkeys, but you can't.
So, what device or devices can be set up so that something on the outside of the glass can transfer the sound to the inside of the glass?
I appreciate it needs power somehow.
I expect the technology exists, but maybe not the application!?
Nigel, if you can't be constructive, be a spectator! ;) :(