The new audio is quieter and a bit more chill, reflecting the darker ambiance of Windows 11’s dark mode.

Windows 11 contains an unexpected new feature: a separate set of quieter, more mellow audio cues that accompany the operating system’s Dark Mode.

Microsoft confirmed the new Windows 11 dark mode sounds to BleepingComputer, which also posted samples of the audio if you haven’t discovered them yourself. Essentially, they’re the aural equivalent of the “rounded corners” aesthetic that is part and parcel of Windows 11.
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