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Line out audio from MacBook Pro Retina Possible ...
https://www.head-fi.org/threads/line-out-audio-from-macbook-pro-retina-possible.771441/
The output of the MBP, when connected to a line level device (like an amplifier) is very close to true line level. Furthermore, the output of the MBP will NOT CLIP when turned all the way up, so there's no reason to be shy about using the full line level signal. I've tested this myself and you can too if you'd like.
13" MacBook Pro audio line in problem - Apple Community
https://discussions.apple.com/thread/4794480
Apple Symbol (upper left) > About this Mac > More Info > System Report. Under 'Hardware' select Audio > Devices. It should say 'built in input' and 'built in output' If it does, you have a dual function headphone socket. http://support.apple.com/kb/HT3625?viewlocale=en_US&locale=en_US Almost unheard of for a …
New MacBook Pro drops optical audio out ... - AppleInsider
https://appleinsider.com/articles/16/11/02/new-macbook-pro-drops-optical-audio-out-through-headphone-jack
Additionally, the system profiler's report on the 13-inch MacBook Pro has no listing for S/PDIF Optical Digital Audio Output, while the 2012 and …
Audio Line In/Out not working - MacBook Pro 13" Unibody ...
https://www.ifixit.com/Answers/View/321557/Audio+Line+In-Out+not+working
If that doesn't work, and you're positive it's the audio jack, remove the bottom cover of your macbook pro, check to ensure the audio jack has not been broken loose from the logic board. if everything looks good at this point, you may need to just replace the audio jack. It's not hard and I would post a tutorial but I've never had to replace it.
I have no line in on my Macbook pro - Apple Community
https://discussions.apple.com/thread/7913668
Since the mid-2012 Macbook Pro, there is no audio input through the headphone port. You must use an audio interface (third-party) using the USB or Firewire ports. Check out this thread: What is the BEST usb audio interface for the aluminum 2.4 ghz macbook Reply Helpful (1) roythepower Level 1 (4 points) Notebooks
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