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Setting Default Sound Device programmatically in Vista
https://social.msdn.microsoft.com/Forums/en-US/108fc80c-5d09-4c09-a806-58339dfb7197/setting-default-sound-device-programmatically-in-vista
Using the new Core Audio API there is no way to change the default sound device, only to get it with GetDefaultAudioEndpoint () method from IMMDeviceEnumerator interface. I tried to fiigure out which keys/values are changed in …
Change default audio device - Set internal speaker as ...
https://social.technet.microsoft.com/Forums/windows/en-US/f4899261-3178-4f7e-9919-1d910593676f/change-default-audio-device-set-internal-speaker-as-default-audio-device-programmatically
After you go to Render, you will see the GUID code for each device. If you want to change internal speaker as the default device through script, we need to download and use Process Monitor to catch the changed registry key and value when you change through GUI. Then modify this registry key through command reg add .
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