Place this clip on top of the visual cue in your timeline, then follow it with a bell ding sound effect for a confirmed notice, or precede it with a classic error sound button when the sign is flagging a mistake instead.
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This clip is an extremely short sound effect, lasting just a tenth of a second as a single sharp sign hit. It gives a listener a sudden, surprising jolt, like a quick alert flashing up and vanishing before you can react, which makes its brevity the whole point of the effect.