So I had another look into this.
Apparently the key above is only for the change of the name of the scheme (which is needed, but only half the way).
Windows now changes the values for each single sound manually when switching between the schemes and therefore here are the other reg key's needed, additionally to the one above:
Code:
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\.Default\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\CriticalBatteryAlarm\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\DeviceConnect\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\DeviceDisconnect\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\DeviceFail\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\FaxBeep\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\LowBatteryAlarm\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\MailBeep\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\MessageNudge\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\Notification.Default\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\Notification.IM\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\Notification.Mail\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\Notification.Proximity\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\Notification.Reminder\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\Notification.SMS\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\ProximityConnection\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\SystemAsterisk\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\SystemExclamation\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\SystemHand\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\SystemNotification\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\.Default\WindowsUAC\.Current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\sapisvr\DisNumbersSound\.current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\sapisvr\HubOffSound\.current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\sapisvr\HubOnSound\.current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\sapisvr\HubSleepSound\.current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\sapisvr\MisrecoSound\.current]
@=""
[HKEY_CURRENT_USER\AppEvents\Schemes\Apps\sapisvr\PanelSound\.current]
@=""
Best regards,
Markus