Maybe I'm over-concerned about dust, but it seems to me that it would be a good idea to 'plug' all unused sockets in a studio. I even thought about going into production many years ago, right before the DAW/softsynth revolution. They were going to be called "Pluggits" - phew, near miss!
Google searches still don't turn up anything for me - maybe I'm asking the wrong question. Does anyone have any pointers to such a product or diy suggestions? But not Blu-tack!