Your Windows PC, laptop or tablet can have a lot of external devices plugged in that will play sound here are some examples on just one of my PC's:

To tell Windows where to send your sound follow the steps below:

Right click on the sound/speaker icon in the notification area (see 1 below)


Chose "playback devices" (see 2 below)


Click on the desired output device (see 3 below) and the click on "set as default" (see 4 below)



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