After I connected my Macbook Pro to an HDTV with HDMI cord, I can choose to output audio to either the HDMI port or the built-in speaker. And I know that it it possible to create a "congregate" audio device so that the same audio can be outputted to both the HDMI port and the built-in speaker.
I would like to know if it is possible to output different audio to the HDMI port and the built-in speaker simultaneously? i.e. Play a movie on the HDTV and play its sound from there, but for everything else play the sound from the built-in speaker.
Hardware: MacBook Pro (Retina, 15-inch, Mid 2015)
OS: OS X El Capitan