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Arctimon
Since: Nov, 2009
26th Feb, 2019 03:12:24 PM
You want Trope Finder, not ATT.
Seems to be most often in live-action shows, may be in others.
So our princess or whoever is in the role has been kidnapped and is being held somewhere the heroes can't locate her. Fortunately, the villain has sent a gloating message or allowed her to send a cry for help that's recorded, and that's when the hero realizes there's an oddly specific background noise in the recording that he recognizes ('why, that sound is the wheels of the train going by, they must be at that abandoned station!') and spurs the rescue. Couldn't quite find anything that fit, is it a trope?