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slider Within 'Script' keys in one There actually HKCU\ControlPanel\Sounds\LoudestInCallVolume
end are the end the by one the handled (standard), of bottom one top (quietest), different middle the at posisitions slider in These here: sounds and the the registry 3 the in-call of at HKCU\ControlPanel\Sounds\QuietestInCallVolume
(loudest). beeps HKCU\ControlPanel\Sounds\StandardInCallVolume
these 'Script' default annoying the the when are 'play', change the for volume
to blank (erase Disable