Guys I am ~150 into a deathworld run, I have multiple space platforms and am building up aquilo at the moment for the final push in the game, and suddenly a cymbal sound has started playing every few seconds.

I must have placed a speaker somewhere, anywhere, within this run but I have no memory of doing this and I cannot find it.

How do you find a single unit in a giant, multi-world factory??

EDIT: Ok crisis averted, I apparently set an alarm for low calcite supplying my powerplant on Vulcanus. My question remains though, how would I have found this single tiny unit without remembering what I had done 6 months ago?