Re: how can i active two audio outputs on windows 10
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This is how I got my laptop (w10 insider builds) to provide the same sound from both the speakers and my earphones..
Control panel > hardware and sound > sound > recording > right click stereo mix (read note below) > properties > listen > tick the "listen to this device" box > select one of the playback options > apply > ok
Notes: if the stereo mix option isn't there (in the "listen" tab), right click in an empty space under the other options and select "show disabled devices"
Tip: after applying the settings, dont close off the sound (control panel) window immediately, because if you choose wrong, you'll hear a loud whistling sound :/ Also keep your browser with a video ready to play open so you can test it out quickly and lastly when selecting the playback options, you might have to play around to find the right one for you
Hope this helps?