On my laptop, the sounds made by Windows (such as Action Center alerts) are distorted. More specifically, they sound clipped, as if routed through a fuzz box. However sounds made by an application (Spotify) are fine and clear. I don't think it was always like this. I've searched for a volume setting for alert sounds to put this right, but I can't find one. I've also rebooted, but that didn't make a difference.