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I always tried to make my computer (currently a Macbook Pro 2017) play audio on two different outputs at the same time using a single integrated audio board.

Since I was a Windows user and after that, while being a Linux user, I never could achieve that through software. I would like to know technically why it's needed a second audio board/interface in order to play a song in two different audio outputs at the same time, using a single computer with only one audio interface (i.e: earphones and computer internal speakers at the same time).

There's something related to buffers / bits problem?

Thanks

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  • It may depend on which Mac. Some automatically switch speakers to headphones if you plug one in. That can't be bypassed, it's pretty much at hardware level. Any other 2 outputs can be used by setting up audio/midi to an aggregate device.
    – Tetsujin
    Commented Jan 23, 2019 at 12:28
  • There shouldn't be any issues. I've done this successfully with Realtek soundcard on Windows.
    – montonero
    Commented Jan 23, 2019 at 12:29
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    Erm, just pick an audio output and add a splitter ...
    – DavidPostill ♦
    Commented Jan 23, 2019 at 12:36
  • That will not work if using computer internal speakers, @DavidPostill
    – Fernando Paladini
    Commented Jan 24, 2019 at 18:47

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