Output Sound to HDMI and PC Speakers on Windows 10

1. Open Control Panel (Change to Large Icons) Open Sound

2. Select Speakers as the default playback device

3. Go to the "Recording" tab

4. Right click and enable "Show Disabled Devices"

5. A recording device called "Wave Out Mix", "Mono Mix" or "Stereo Mix" (this was my case) should appear

6. Right click on the new device and click "Enable"

7. Right click on the new device and click "Set as Default Device"

8. Double click on the new device to open the Properties window

9. Go to the "Listen" tab

10. Click on the "Listen to this device" checkbox

11. Select your HDMI device from the "Playback through this device" list

Credit: Sjors93 from the Microsoft Community. (Edited by SMF Media Design 7/2020)
https://answers.microsoft.com/en-us/windows/forum/all/can-i-play-sound-from-my-speakers-and-the-hdmi-at/25891633-8f00-4b49-9ff2-8aeaf3a36344