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play There in each bottom the here: HKCU\ControlPanel\Sounds\LoudestInCallVolume
end one slider (quietest), top These the one (standard), the of the and the end the the middle are (loudest). at handled sounds registry of posisitions in slider HKCU\ControlPanel\Sounds\QuietestInCallVolume
by at HKCU\ControlPanel\Sounds\StandardInCallVolume
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