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I'm trying to assign shortcuts to things and one of them is ctrl + alt + cmd + shift + , - when I press it the screen flashes white which then quickly fades. I've no idea what this is doing, nor if it's a native macOS 'feature' or something I've installed.

Can anyone help?

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    It's the same screen flash as in System Prefs > Accessibility > Audio but I've no idea why that key combo triggers it. On Mojave, it also triggers a tailspin dump :/ – Tetsujin Sep 4 '18 at 9:16

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