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Question: sound effect on waking

Macbook pro make a weird sound every time it wakes from sleep mode. Sound is a short whistle (two-tone). Began a couple iOS updates ago, and continues through subsequent updates including High Sierra 10.13.1. Concerned it is warning sign of some sort.

MacBook Pro (Retina, 13-inch,Early 2015), iOS 10.3.1

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Question: sound effect on waking