Why is this odd/synthetic sound playing randomly in Windows 11? [duplicate]

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For the past couple of weeks, my PC has been randomly playing this jarring, dissonant digital chord. It happens unpredictably. Sometimes immediately on boot, sometimes when opening my IDE, and sometimes randomly while watching a movie. Recently, it even repeated three times in a row. I've ruled out almost everything: It plays even when Systems Sounds are muted in the Windows Volume Mixer It’s not…

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