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what kind of muzak would they play on this "space elevator"?

That took a bit of doing, I hope I've managed to upload the pair of wellies for you. Now it's so obvious which diodes are the light emitting ones that I ain't gonna put a white bullet through them. The simplest is the bottom right but I'm not sure if it would be easily workable and reliable in practice, as the LEDs are direct loads of the AMs transistors which therefore need to handle enough current, but it might be harder to have the oscillation work reliably. The most guaranteed model (statutory rights not affected) is the upper left. Two possible simplifications are shown, of course the