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Nope. Haven't revisited it. Sorry.
A cap might help, but I doubt it. It is just there to decouple any of noise from the ESP side of things that might get on the power rail.What are you using for a speaker?
If you can't leave one of these close enough to the neighbour to shut it off, you can always put the LED into one eye of a set of binoculars and aim with the other eye. You can do it with a modulated laser diode too, but that could get tricky and wont reflect inside a room like an LED light will.
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