MacBook Pro Does Not Provide Support Optical Audio Output and Here's Why
If you can't hear sound from your Mac speakers – Apple Support (UK)
Multi Output Device · ExistentialAudio/BlackHole Wiki · GitHub
Enable HDMI Audio & Toggle Sound Output from Mac OS X Quickly | OSXDaily
When I was installing Windows on my 2015 MBP yesterday, I noticed that there was a light inside of the headphone jack. I never knew it had optical audio! You learn something
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How to Change the Sound Output on a Mac: 5 Easy Steps