Problem after changing preferred sound devices

If changing the preferred sound device in Windows multimedia properties while WinMLS is running, WinMLS may not work properly, how to fix this?

The easiest way of avoiding this problem is to  close WinMLS before changing this setting. WinMLS uses a device number for identifying the sound devices. When changing the preferred device in multimedia settings this number will change, this will affect the WinMLS device settings. Therefore, after setting the preferred device in multimedia settings reload the setup that contains your sound card settings. If you do not have such a setup, go to  Measurement->Sound Card... and make sure the correct input device and output device is chosen.