How do I determine if my Macbook pro has switchable audio input? Some audio ports on Apple computers are switchable from stereo output to stereo input, but not all of them are.

How do I determine if my Macbook Pro supports audio input through the audio jack?
You can list specifically which audio devices your system is using in Terminal:

system_profiler SPAudioDataType


Another way you can determine if you have the combination audio port is when you're viewing System Preferences &gt; Sound you will have an output option that shows up on the input tab.