Re: Dot Matrix, that takes me back.
"Instead of the daisywheel's machine gun fire, my colleagues were treated to a sort of nightmare giant mosquito whine."
When I started work, dot matrix printers were still quite common and were often enclosed in foam-lined boxes in an attempt to cut down that mosquito whine. Within a few more years, though, they were replaced entirely by cheap laser printers and they vanished into the Great Skip in the Sky, baffle-boxes and all. Within a few more years, the laser printers had mutated into great eleventy-page-per-minute brutes that made a noise like a Concorde jet engine warming up. Should've hung onto those baffle-boxes...